I must say reading all these suggestions have really inspired me and hope that nick can do these things people suggest. (i know its alot work)
I was thinking that there could be a bomb that is something that attaches the foe to the ground not letting it move and do damage. such as A elemental bomb that whenever you put it down it shoots 3-6 slime(depending on star level) when it shoots tho, it just automatically choose 3-6 foes nearest to you and shoot a slime to each one that makes them stay there for like 3-6s (depending on star level then) while doing damage to the monsters.