Beetle armor

Type	Armor
Defense	18
Body slot	Pants
Tooltip	6% increased movement and melee speed; Enemies are more likely to target you
Rarity
Sell	3 GC60 SC
Research	1 required

Type	Armor
Defense	23
Body slot	Helmet
Tooltip	6% increased melee damage; Enemies are more likely to target you
Rarity
Sell	6 GC
Research	1 required

Type	ArmorSet
Defense	: 61 /  : 73 (set)
Set Bonus	: Beetles increase your melee damage and speed;  : Beetles protect you from damage
Rarity
Sell	14 GC40 SC (set)

Beetle armor's effect with the Beetle Shell equipped.

Beetle Shell's effect

Beetle armor is a Hardmode, post-Golem melee armor set consisting of the Beetle Helmet and Beetle Leggings, as well as two different chestpieces: the Beetle Scale Mail and Beetle Shell, providing offensive and defensive bonuses respectively. Crafting the full set with one chestpiece requires a total of 18 Beetle Husks and a full set of Turtle armor [54 Chlorophyte Bars (270 Chlorophyte Ore), and 3 Turtle Shells]. Crafting all four pieces requires a total of 26 Beetle Husks, 78 Chlorophyte Bars (390 Chlorophyte Ore), and 4 Turtle Shells.

The full set grants the following effects while equipped:

+61 defense
+14% melee damage
+8% melee critical strike chance
+12% melee speed
+12% movement speed
+500 aggro
The Beetle Might offensive buff: Upon dealing melee damage to enemies, melee damage and speed is increased by increments of 10%, up to 30%. The rate at which the buff increases depends on the player's DPS. Dealing less than roughly 180 DPS will not grant Beetle Might. The buff diminishes at an accelerating rate while the player does not deal damage.

+73 defense
+11% melee damage
+5% melee critical strike chance
+6% melee speed
+6% movement speed
+900 aggro
The Beetle Endurance defensive buff: While the player is not taking damage, damage reduction for the next hit is increased by increments of 15%, up to 45%. The buff will increment in strength every 3 seconds while avoiding damage. Each time the player is hit, the buff is decremented by one step. This buff also has a visual effect showing one to three beetles flying around the player, indicating the buff's current strength.

Set

Chest variants

Beetle Scale Mail

Statistics

Type	Armor
Defense	20
Body slot	Shirt
Tooltip	8% increased melee damage and critical strike chance 6% increased movement and melee speed
Rarity	08*
Sell	4 GC80 SC
Research	1 required

Internal Item ID: 2200
Internal Armor ID: 105

Beetle Shell

Statistics

Type	Armor
Defense	32
Body slot	Shirt
Tooltip	5% increased melee damage and critical strike chance Enemies are more likely to target you
Rarity	08*
Sell	4 GC80 SC
Research	1 required

Internal Item ID: 2201
Internal Armor ID: 106

Crafting

Recipes

Result	Ingredients	Crafting station
Beetle Helmet	Beetle Husk4 Turtle Helmet	Mythril Anvil or Orichalcum Anvil
Beetle Leggings	Beetle Husk6 Turtle Leggings
Beetle Scale Mail	Beetle Husk8 Turtle Scale Mail
Beetle Shell	Beetle Husk8 Turtle Scale Mail

Notes

Although the Beetle Shell's set bonus says "Beetles protect you from damage", it will not prevent the full damage of attacks, but can only prevent a portion of damage instead.
While the Beetle Shell is equipped without any items occupying the social slot, wings will not appear unless the player is in mid-air, similar to the Turtle armor, Leaf Blower, and Heat Ray.
Other damage-reducing effects, like the Endurance Potion, stack with the Beetle Endurance buff.

Tips

Beetle armor is not a true upgrade to Turtle armor. The offensive version has lower defense than Turtle armor, and the defensive version has lower offensive bonuses than Turtle armor. Neither version has the thorns effect nor the unconditional 15% damage reduction that Turtle armor has. However, Beetle armor offers more powerful specialization in offensive or defensive playstyles.
When using the Beetle Scale Mail, the Terra Blade benefits greatly from its massive melee speed bonuses. Most other melee weapons do not fire projectiles faster with increased melee speed, making Beetle armor inferior to hybrid sets when using them (unless attacking at close range).
The Beetle armor with the Beetle Shell has the lowest damage boosts out of all Hardmode melee armor sets, with lower offensive boosts than even Molten armor. Due to these low bonuses, players can use ranged or magic weapons and deal similar amounts of damage.
The full set with the Beetle Shell has the highest defense of any pre-Moon Lord armor set. However, even higher defense (80) can be achieved by swapping the head and leg pieces for Hallowed Mask and Valhalla Knight's Greaves, which has the additional benefit of providing far better offensive melee bonuses.
Beetle armor at its 45% state, the Worm Scarf (17%), and the Endurance Potion (10%) will reduce damage by nearly 60%.

(100%-45%)×(100%-(17%+10%)) = 40.15% damage taken = 59.85% damage reduction

Frozen Turtle Shell (25%) will further increase it to almost 74%.

(100%-45%)×(100%-(25%+17%+10%)) = 26.4% damage taken = 73.6% damage reduction

Trivia

With the full Beetle Endurance buff and a Lifeforce Potion (600 HP) and/or Endurance Potion, it is possible to survive a hit from the Dungeon Guardian.
It is the only armor set to have multiple chest piece variants.
Solar Flare armor(Desktop, Console and Mobile versions) provides more defense than either of the chest variants. However, the Beetle Shell provides 45% maximum damage reduction as opposed to the Solar Flare shield's maximum 30% reduction.