User blog comment:Vanguard13/Pick Your Poison (Ammo, that is)/@comment-2250460-20120811201535

For Mass Effect it's cryo ammo because it just looks cool, and for whatever reason my game is glitched and I CANNOT get Tungsten ammo.

For Mass Effect 2 it Inferno ammo because it deals with Scions, and it looks cool.

For Mass Effect 3 it's the same thing as Mass Effect 2, although in my current playthrough I am experimenting with Warp ammo.