@snipetildawn - you can also put a temple at entrance to make them blow invisiblity early. The 50% dodge is a bad idea. That is the ability assassins had in first game and it made them worse than ninjas
@Kafriel, you probably didn't have enough command or maybe you didn't give them back up. I had no problem stomp that stage.
As far as the game goes, it has potential. But, it is too easy once you equip all summon spells and get you command up to 8 or 9. Every stage was easy after that.
Killing void eater:
1st method: stay away until you are in good position, then walk in front of it's line of sight. it should start it's density stream. when it does, walk away towards it but away from the stream. once it fires you will be pull toward the stream. try your best to get close to the void eater while not falling into the stream. If you get close enough you can whack it.
2nd method, if you are standing next to it when it forms you can smack it before it releases a compression blast, maybe
3rd method, grenade, box gun, or armor
Grinder must have they shell cracked opened, afterwards 5 hits from your splatmaster.
Can be crack by:
Running into a gray (while harden), acid pool, razor queen's blade, razor glaive (upgraded sword), or another grinder (even if it's shell is already cracked)