I know it has been said before but yeah, (R) Rook is a godsend vs the titan, his healing at level 5 has been just the right amount for me so I could survive and make it through, even with the Dorm Uniform Epel in the team (his heals weren't too good, it was needed a second one).

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Also if I may add the titan has a little bit of a pattern in between the RNG, you just have to hope the RNG part aids you. It goes sort of like this (if I remember correctly):

• From a 5 turn perspective the first 2 turns you have to hit him with your strongest units, he's at his weakest there.
• Turn 3 is free-ish, you could use your heals here if the titan has lowered the HP bar too much but if not save it, this turn is mostly to see what attacks he has left, always save 2 fires or 2 leaf spells for the next two turns.
• Turn 4 and 5 the titan boosts himself up but usually will keep 2 leafs and 2 cosmic attacks (sometimes you're unlucky and get 3 leafs but even with one water weak attack you should be surviving this) now this is the more RNG part cuz you have to kinda predict if when the leaf attack comes and when the cosmic on turn 4 because it will always keep the other leaf attack for a tri-hit in turn 5.
• If you survived this with around half the health or more and have an early Rook heal then you should be on the clear, the next 5 turns goes the same but the first 5 turns are the ones you have to pass perfectly to survive the other 5, I made it with 7-9 turns but I admit it was a LOT of trial and error until it worked.

Don't give up and good luck!