i ran acid ele about 30 times or so and didn't get one. i ended up switching to the faery dragon spawn w/ dual wraith form throwers. ended up getting tinker legs, selling them, buying 2x breast plates & a ssi cloak lol.
i woulda done the acid ele spawn more, but its laid out junky and works slow compared to a spawn like faery dragons which is wide open, and can be cleared start to finish in like 5 minutes.