Health regeneration
“Time heals all wounds.
— A loading screen tip
This page discusses how the player health regeneration mechanism works, and how equipment and buffs affect the regeneration rate.[1]
If the player is not hit for a short time, health starts regenerating until the player is hit again. The rate at which the player regenerates health is dependent on five factors:
- The player's maximum health: a higher maximum health means a faster regeneration rate.
- Movement: if the player is standing still, their regeneration rate is increased by a factor of ×1.25.
- (Desktop, Console and Mobile versions) Rest: if the player is lying on a bed or sitting on a chair or sofa, their regeneration rate is boosted by a factor of ×1.5.
- Time since the player was damaged: the longer it has been since the player was last damaged, the faster their regeneration rate will be; this caps at 60 seconds (1 in-game hour) after which the regeneration rate no longer rises.
- Buffs and debuffs: for a feel, a detailed explanation is given below, but keep in mind that the numbers do not represent health regeneration directly; they are just factors (higher is better).
The time the player has to wait until regeneration starts is highly variable from roughly 1/10th of a second to 17 seconds (32 seconds on Expert Mode) and is again dependent on maximum life, movement, and buffs/debuffs.
Source
Below is a list of things that provide health regeneration.
Item | Regeneration (per second) | Trigger | Notes | |
---|---|---|---|---|
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(Desktop, Console and Mobile versions) 1 / (Old-gen console and 3DS versions) 0.5 | Equip | ||
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(Desktop, Console and Mobile versions) 1 / (Old-gen console and 3DS versions) 0.5 | Equip | ||
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0.5 | Equip Moon Charm or its upgrades, during night | ||
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1 | Equip during day | ||
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1 | Equip during night | ||
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1 | Equip | ||
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1 | Equip | ||
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1 | Equip | Slowly increases regeneration rate over time, canceling out when the player moves or uses most items. Expert mode only. | |
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2 | Consume Regeneration Potion | Buff lasts for 8 minutes. | |
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1 | Stand in Honey | Buff lasts 30 seconds after leaving Honey. | |
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3 | Near the Dryad | ||
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0.5, 1.1×base regeneration rate | Stand near a Campfire | ||
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1 | Stand near a Heart Lantern | ||
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1.5×base regeneration rate | Equip full set | Heals 1 health per "tick". Like natural regeneration, "tick"s occur more frequently when standing still or when not damaged recently. | |
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(Desktop, Console and Mobile versions) 2 / (Old-gen console and 3DS versions) 3 | Hit enemy while wearing full set of Palladium armor | Buff lasts for 5 seconds. | |
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3 (1 per piece) | Equip | ||
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1.5 | Damage enemies with weapon | Provides regeneration buff while weapon is damaging enemies | |
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3 per level | Collect a Life Booster | Lasts for 8 seconds and can be stacked up to three times. One stack is removed at a time, upon which the timer resets itself. | |
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4 | Equip | ||
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2 | Equip | ||
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2 | (Desktop, Console and Mobile versions) Sitting in a Chair | ||
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3 | Hit targets with the Ham Bat | Buff lasts for 7 seconds. | |
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Speeds up regeneration rate by 20% | Consume the item | Effect lasts permanently. |
Details
Health regeneration (HR) is determined by the following formula:
[math]\displaystyle{ \mathit{regeneration_{health}} = \frac{1}{2} \times \left( \left( \underbrace{ \left( \frac{\mathit{health_{max}}}{400}\times0.85+0.15 \right) \times \mathit{time} }_{\mathtt{regen}} \times \underbrace{ \mathit{move} \times \mathit{rest} \times \mathit{expert} }_{\mathtt{special}} \right) + \underbrace{ \mathit{buff} }_{\mathtt{buffs}} \right) }[/math] and gives the health per second the player regenerates.
The formula can be split in to 3 parts and a bit of rounding:
- The
regen
part consists of:healthmax
: maximum health of the player.time
: factor for the time that has passed since the last hit taken. A detailed definition can be found in the detailed explanation.- The
time
value starts at 0, and rises by 1 every 5 seconds for the first 30 seconds. After that, it rises by 1 every 10 seconds, to a maximum of 9. (0 ≤time
≤ 9) That means this part is 0 for at the first 5 seconds, but reaches 6 after 30 seconds, and 9 after 60 seconds. This does not consider the Shiny Stone's effect, which can raise thetime
value to a maximum of 38, and alters the algorithm in other ways (see below).
- The
- The
buffs
part:buff
: modifiers from the buffs and debuffs. All "R+n" values from the Buffs section can be added here (the n-part) (there are some buffs which affect other parts of the algorithm; again, see below). This is the easiest part as the buffs are just added to the regeneration. This takes place after all other natural regeneration calculations, as regeneration from buffs is not affected by special modifiers or Bleeding. However, many (see list below) will be nullified by damaging debuffs, like Poisoned.
- The
special
part consists of:move
: either 0.5 if the player is moving or 1.25 if the player is standing still.rest
: 1, except if the player is sitting on a chair or lying on a bed, in which case it is 1.5.expert
: 1, except if the player is in expert mode and does not have the well fed buff, in which case it is 0.5.
All this is rounded to the nearest whole number and finally divided by 2 to get the regeneration per second.
The player will regenerate HR per second, not considering the Shiny Stone and Rapid Healing. This means if the player has HR=0.5, they will regain 1 health per 2 seconds; and if the player has HR=5, they will regain 5 health per second (technically, 1 health every 12 ticks[2]).
Notes
- Buffs can help to reduce the time when the regeneration starts.
- A starting player will start regenerating health after 12 seconds (17 seconds on expert mode) if standing still or 17 seconds (32 expert mode) while moving. After consuming their first Heart Crystal, this drops to 7 seconds while standing still.
Technical explanation
The player has these health regeneration stats:
- Regeneration Time (RT): How long the character has been regenerating for. This normally increases +1 per tick, capped at 3600, and resets to zero when the character takes damage (stopping regeneration).
- Regeneration Rate (R): Hit Points (HP) regenerated per tick (1 point of R is equal to 0.5 HP/s). This increases the longer the RT (the longer the player has been avoiding damage).
- Regeneration Counter (RC): Increases by R per tick, becomes 120 or over, or -120 or less, it will be reduced or increased by 120, and player will gain or lose 1 health.
The Regeneration Rate (R) determines how fast the RC changes. R is normally 0 or positive, but could be negative if the player is inflicted with any life-draining debuffs, like Poisoned.
Calculation
The base Regeneration Rate (R) is mainly determined by the Regeneration Time (RT), player's max Health (mHP), and whether player is standing or moving.
First, The RT is converted to an Effective Regeneration Time (eRT).
- If RT <= 1800, each 300 RT boosts eRT +1.
- If RT > 1800, each 600 RT above 1800 boosts eRT +1.
Here is an illustration of the relationship between RT and eRT:
RT | 0~299 | 300~599 | 600~899 | 900~1199 | 1200~1499 | 1500~1799 | 1800~2399 | 2400~2999 | 3000~3599 | 3600 |
---|---|---|---|---|---|---|---|---|---|---|
eRT | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
Then, the base Regeneration Rate R = (mHP / 400 * 0.85 + 0.15) * eRT
- If the player is standing still, R will be multiplied by 1.25.
- If the player is moving, it will be multiplied by 0.5.
Finally, it will be rounded to the nearest whole number.
So, for a brief conclusion: the longer player not getting hurt, the higher maximum health player has, the higher for the natural health regeneration rate. Also, standing still gives a 2.5X healing bonus compared to moving. Using an item does not count as moving.
After all of the above, if the player is in Expert Mode and does not have a Well Fed buff, R will be multiplied by 0.5.
Item and buff effects
R is also affected by other items and buffs.
Note: Despite drowning being similar to life-draining debuffs, it only resets the RT and does not affect the RC and R. It directly reduces Hit Points instead.
Buffs
Item/Buff | Effect |
---|---|
Heart Lantern | R +2 |
Campfire | R +1 and base R x1.1 |
Crimson armor | Base R x1.5 RT +1 per tick |
Life Drain | R +3 (and 1 per 2 additional enemies affected) RT +5 per tick (and 1 per 2 additional enemies affected) |
Rapid Healing | RC +4 per tick |
Resting or Sitting | Base R x1.3
RT +3 per tick |
These apply if the player does not have any life-draining debuffs:
Item/Buff | Effect |
---|---|
Werewolf | R +1 |
Band of Regeneration
Solar Flare armor (each piece) |
R +2 |
Regeneration | R +4 |
Dryad's Blessing | R +6 |
Valhalla Knight's Breastplate | R +8 |
Life Nebula | Sets R = 0 if it is less than 0 R +6 for each buff level (18 at the third level) |
Regen debuffs
- Feral Bite debuff: Base R is multiplied x0.5.
- Bleeding and Obstructed debuff: Keeps RT reset to 0, so base R remains at 0.
Life-draining debuffs
These cancel the R boosts in the second table above, reset RT to 0, and reduce R by these values:
- Poisoned: -4
- On Fire!: -8
- Venom, Cursed Inferno, Frostburn: -12
- Burning: -60
- Suffocation: -40.
- Electrified: -8 (when standing still), or -32 (when moving).
- The Tongue: -100 only in Expert mode.
Note: If the player is under the debuff of Burning or Suffocation, instead of losing 1 health when RC reaches -120, the player will always lose 5 health when RC reaches -600.
Honey
If | Then |
---|---|
R ≤ -4 | R boosted +6 |
-4 < R ≤ 0 | R set to 2 |
R > 0 | R boosted +2 |
- Which means Honey reduces the rate of any life-draining debuff.
- Honey additionally boosts RT +2 per tick (RT increase is 3× as fast).
Shiny Stone
If the player is using items or not standing still, it will reset the multipliers of the Feral Bite debuff and Expert mode to 0.75 from 0.5. Both of them only reduce the regeneration speed by 25% instead of the previous 50%. It will also multiply base R ×1.1.
If the player is not using any items and almost standing still (it allows small amounts of movement), the following effects are applied in addition to those above:
- If the player has any life-draining debuffs so that R is less than 0, R is reduced by half (if the player also has Honey buff, then it increases R by 4 first (but no more than 0), then, R is reduced by half, finally, the Honey buff additionally increase R by 2.).
- R +4.
- RT +4 per tick.
- If 90 < RT < 1800, RT is reset to 1800.
- When RT > 3000, it will remove the RT cap, and every 300 RT above 3000 will boost eRT +1 (this part is capped at 30, so it will give an eRT maxed at 38 instead of the previous 9).
- Finally, if R > 0, RC is boosted +1 per tick.
So, if the player is at 600 max HP, with the Shiny Stone and standing still, in Expert mode, without Well Fed:
- R = (600 ÷ 400 × 0.85 + 0.15) × 38 × 1.25 × 0.75 × 1.1 + 4 = 63
- RC is additionally boosted +1 per tick
- = 32 Hit Points per second regeneration rate.
A more complex example
To illustrate how items, buffs and debuffs interact with each other, here is a more complex example:
Assume the player has the Venom, On Fire! debuffs, the Regeneration and Honey buffs, has the Shiny Stone and Charm of Myths equipped, is standing next to a Heart Lantern, and is standing still.
According to the above, here is how life regeneration can be determined:
- The Regeneration buff and Charm of Myths (pre-1.4.1) increase R by 4 and 1 respectively, so, R = 5.
- The life-draining debuffs cancel out the effect above and set R to 0.
- The Venom and On Fire! debuffs reduce R by 12 and 8 respectively, so, R = -20.
- Because R < 0, the Honey buff increases R by 6, so, R = -14.
- As R is still less than 0, the Shiny Stone cuts it in half, so, R = -7.
- Then the Honey buff, Shiny Stone, and Heart Lantern increase R by 2, 4, and 2 respectively, so, R = 1.
- Because the player has life-draining debuffs, RT will remain at 0, so player will not have natural health regeneration.
- As R is greater than 0, the Shiny Stone will provide the RC +1 per tick bonus.
Thus, the player has R + 1, and will gain health.
But, if the player places a Campfire nearby, it will give R +1 boost and give the player a 0.5 HP/s regeneration rate. In addition, because R > 0, the Shiny Stone will now provide a RC +1 per tick bonus, granting an additional 0.5 HP/s regeneration rate. Thus, the player will now have a 1.5 HP/s regeneration rate.
However, if the player has the Rapid Healing buff (which gives the RC +6 per tick effect and does not affect R) instead of placing a Campfire, the Shiny Stone will not provide the RC +1 per tick bonus. So instead, the player will have a 3.5 HP/s regeneration rate.
References
- ↑ Information taken from the
Desktop 1.3.5.3 source code, method
UpdateLifeRegen()
inTerraria.Player.cs
. There may be inaccuracies, as the currentDesktop version is 1.4.4.9.
- ↑ A tick is a time unit countable by the software. Most of Terraria's updating logic happens every tick. A tick has the length of 1/60th of a second, hence there are 60 ticks in a second and 3600 ticks in a minute.