Deacon, not even a question. 😂

Would also be good to keep Mausoleum Mage, Klodd, Geo, Sinesha, High Khatun, Jizoh, Templar, Paragon, Bellower and Master Butcher. 

Deacon is a great champ to level. He brings AoE Dec Def and TM boosting and a speed aura. He overperforms everywhere. :)

After that I'd start working on Geomancer, who is one of the best boss damage dealers in the game courtesy of his reflect.

Your main team right now can be Deacon, Kael, Ultimate Deathknight, Deliana and Geomancer. :)

Okey, I'll work on them thanks!! :) 

Your arena team should be

1.) Deacon as the fastest champion...will increase your tunr und probabky place Defense down

2-3 )Kael, Deliana -> nukynuke

4.) UDK