Did this the other day... only problem was you get NO sp/xp at all for killing these guys, didn't Yoshi learn from this mistake already? There were about 40+ mobs and I got 4 deaspected crystals (Or whatever they are called) at the end^^ Woulda got a good 4k+ sp, least I got SOMETHING outta it :P (Did it as a 22 PUG)