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Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.
First Fractal.png
Unobtainable on the Old-gen console version Old-gen console version and Nintendo 3DSNintendo 3DS version version
The item(s) or effects described on this page exist as functional game items, but on the Old-gen console version Old-gen console version and Nintendo 3DSNintendo 3DS version version, cannot be acquired through normal gameplay.
  • S.D.M.G. item spriteold S.D.M.G. item sprite
Stack digit 1.png
Uses ammoBullets
Damage85 (Desktop, Console and Mobile versions) / 35 (Old-gen console and 3DS versions) (Ranged)
Knockback2.5 (Very weak)
Critical chance14% (Desktop, Console and Mobile versions) /
4% (Old-gen console and 3DS versions)
Use time5 (Insanely fast) (Desktop, Console and Mobile versions) /
6 (Insanely fast) (Old-gen console and 3DS versions)
Tooltip66% chance to save ammo
'It came from the edge of space'
RarityRarity level: 10 (Desktop, Console and Mobile versions) /
Rarity level: 8 (Old-gen console and 3DS versions)
Sell15 GC
Research1 required
  • Internal Item ID: 1553 (Desktop, Console and Mobile versions)
Obtained from Obtained from Obtained from
Classic mode icon.png Classic
Expert mode icon.png Expert
Master mode icon.png Master
Moon Lord(Desktop, Console and Mobile versions)Moon Lord's Head.gifMoon Lord(Desktop, Console and Mobile versions)122.2%
Treasure Bag
(Moon Lord)
Treasure Bag (Moon Lord)Treasure Bag
(Moon Lord)
(Desktop, Console and Mobile versions)
Attacking a Target Dummy with the S.D.M.G.

The S.D.M.G. (Space Dolphin Machine Gun) is a Hardmode, post-Moon Lord gun. It can be considered an endgame upgrade of the Megashark, with a slightly faster firing rate, a 66% chance not to consume ammunition, and a noticeably higher damage output. Its abilities are also similar to those of the Chain Gun, but it is more precise and deals significantly more damage, though with a slightly slower rate of fire. The S.D.M.G. also has a base 14% critical strike chance, as opposed to the usual 4%. The S.D.M.G. has a 2/9 (22.22%) chance to be dropped from the Moon Lord.

Its best modifier is Unreal.


  • The 66% chance not to consume ammo stacks with similar bonuses.
    • Despite the high chance not to consume ammo, its fire rate can still consume a stack of ammo fairly quickly.
  • Shots fired from the S.D.M.G. emit a moderate amount of light for their entire path.
  • In the Old-gen console version Old-gen console version and Nintendo 3DSNintendo 3DS version version, the S.D.M.G. is unobtainable without the use of glitching or inventory editing, but functional if edited in. Its stats in these versions are vastly inferior to the stats in the Desktop version Desktop version, Console version Console version, and Mobile version Mobile version.


  • The S.D.M.G. pairs well with certain types of bullets:
    • The Luminite Bullets' piercing capabilities complement the S.D.M.G.'s high rate of fire and accuracy for crowd control.
    • Using Ichor Bullets is a cheap and powerful alternative to Luminite Bullets. The base damage of 13 in addition to the Ichor debuff makes it a great weapon against powerful enemies such as bosses.
    • The high accuracy of the gun allows for the shards of Crystal Bullets to consistently hit large enemies.
    • The Chlorophyte Bullets' homing abilities make it easier to hit small targets or dangerous enemies. Additionally, the S.D.M.G.'s ammo conservation helps to conserve resources, because crafting Chlorophyte Bullets is rather costly.
  • The stealth mode of the Vortex armor increases the S.D.M.G.'s damage output even more. It is particularly helpful for taking down the Moon Lord.
  • Compared to the Vortex Beater, the S.D.M.G. is more accurate, but is slightly lacking in crowd control due to the former's homing missiles.


  • This item is a reference to the game Edge of Space (hence the tooltip 'It came from the edge of space'), in which Terraria is also referenced.
  • This weapon goes along with the theme of aquatic automatic weapons, such as the Gatligator, as well as its predecessors, the Minishark and Megashark.

See also

  • S.D.M.G at the Official Edge of Space Wiki


  • Desktop
    • Damage increased from 77 to 85.
    • Chance not to consume ammo increased from 50% to 66%.
  • Desktop
    • Made obtainable, now drops from Moon Lord.
    • Damage increased from 35 to 77.
    • Critical strike chance increased from 4% to 14%.
    • Use time decreased from 6 to 5.
    • Rarity increased from Yellow to Red.
  • Desktop 1.2: Introduced, but unobtainable without the use of inventory editors, mods, or cheats.