I essentially used the same team lineup as @mpolo for this run of Fortitude.
Stats might be different but mine are:
Caedmon (4^70), Melendor (4^70+19), Boril (4^70), Gaedirus (3^40), and Rigard (4^70+18).
If you canāt already tell, you arenāt going to beat the bosses in Level 3 with your awesome specials, because Druid / Cleric classes arenāt really known for their high damaging special skills. You really have to make sure your healer-abound teams can outlast(often times out-heal) the combined team of Chun-Li, Boring-O, Groot and kill them with Tile Damage.
When Fortitude first came out, people were wondering what to do to improve output damage, Brienne was frequently brought up as the solution as her Berserker Fury can help with just that. However, sheād have to survive the mob in order to be useful and a few focus fires and mishaps can actually get her wiped out before even your āteamā of healers can react. Up to the last one ToF, Iāve been bringing Brienne, but this time decided to substitute her with Gaedirus (not maxed), but has higher stats than a maxed Brienne, to give him a try, as otherwise, there might not be much action for him elsewhere.
So his placement next to Rigard is to purposely help increase the damage output for Rigard to improve tile damage against Vivica, and help keep Boril alive as he will be the focal point for damage output (either slash damage returns or the AOE from AI Horghall), Caedmon is there for sniping, and dispelling opponent Boril (whose placement means his Riposte wonāt be able to benefit Horghall), and Melendor, of course for another heal and safe dispelling of Riposte.
So the difference this time around is that Gaed survives longer than Brienne, but his special, in addition to being slow to charge, really hits like a wet noodle, so really donāt count on him to do any great damage with his special, the secondary abilities is what you called him up for (sure youād have liked to have it apply to everyone, but you canāt have everything, and he wouldāve been a more often used hero).
I still dropped a few bomb and dragon attacks to help damage output. I usually do try to focus fire on Boril first, but due to tiles this time around, Horghall actually died first. Caedmon, although you donāt really want him to be dispelling the Riposte while hitting Boril or Vivica, with multiple healing options, it might still be acceptable, but Melendor is who I used most for the job. Ghosting tiles on the side may help waiting for Riposte to pass, but you really donāt want to wait too long otherwise Vivica might heal again or Boril is just going to replenish his Riposte again.
Once I got the opponent down to Vivica only (typically the last one standing), I actually find it fun to see if I can damage her more than she could heal. So itās Rigard on Purple Tiles, Caedmon for the Snipe, Boril with the Riposte. Green tiles will do more damage on neutral with 3 heroes, Purple from Rigard as well as Blue from Boril will be improved while under the influence of Gaedās special.
Itās one of those war of attrition that you just have to watch the opponent movement and counter with your own.