Paragon has unkillable skill. He will become a tank. Do not leveling him. Only need to upgraded unkillable skill. Then simply used him as a bait for spiderlings. As long the spiderlings keep attacking him then the rest of the battle is just about turnmeter reduction, speed down, decreases def + damage dealer.
Coldheart A3 is very good for damage dealer + turn meter reduction. Focused on critical damage%, critical rate% and speed.
Psylar A3 is for speed down + turn meter reduction
For the rest 2 characters you can try different combination.
Tayrel may still become useful. A2 ---> decreases def. A3 ---> turnmeter reduction
High khatun ---> speed booster
Or using Ultimate galek + doom priest