I already have a DD and a Ghoulem so I was just wondering what Warlock and Treantaur specialize or if they should be prioritized in any way
I would try and get your dd and warlock up they will help you in most game modes. And ghoulem next. And just a side note if after you do get them up tree is good he is used in a lot of game modes and can bring your dead heroes back to life. Take a look at the section in game that explains the heroes and what they will do for you in game as you reach each level of skill.
I think the guys pretty much stated it, however Tree runs a spot in Lava and is still being used by snipers in GW to revive their heroes, so for not he is still very useful but not a top tier hero.
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Drake - can be used in just about every game mode for offense or defense
Ghoulem - can also be used in various game modes. Great in close ranged combat like LBF & Arena. Very useful in Lava 3 if you don't have any of the beastly new heroes
Tree - I use mainly for Lava 3 to bring all fallen heroes including my own, back to life, but he's useful in other modes for the same reason.
Warlock - can be used with as offensive or defensive sniper. Paired with your Drake and depending your might, people will have a tough time raiding your base and you should have an easier time getting through dungeons....