Battleheart/Monsters

Red Slime
The Red Slime will only follow one member of your team so use this to your advantage. Have the targeted member run away while you attack with the other memebers

Ooze
There will be one large Ooze that will explode into about 7 green slimes which will try to come back together in the center. Having members in your party that can attack multiple enemies at once can help a lot.

Golem
This boss doesn't make minions, making a Mage with the teleport ability quite handy for a distraction while other characters attack.