I've fought the final battle of SSS twice, and got completely massacred both times.
Lineup for the 1st attempt: Eder (fighter tank), Konstantin (tanky-skald), Watcher (swashbuckler), Xoti (sniper and priest), and Ydwin (sniper and pure cipher)
I discovered that the big croc is nearly imune to all afflictions, particularly the Mind ones, which largely made Ydwin far less than satisfactory, and the shred spells she does have are, of course, mostly Fort based, against a big croc with a huge Fort save.
Truth be told, I didn't expect much from the first attempt. I expected a nasty battle, and as usual, I mostly play the first encounter just to scope it out.
Lineup for the 2nd attempt: I replaced Ydwin with Aloth. (Note all party members are level 20.)
My plan was to spam summons at the crocs and hide behind them, while using ranged attack and magic to take out the crocs. The problem is that the summons got blown away so quickly, they barely mattered. Also, I had replaced Eder and Konstantin's heavy plate armor with light armor, since I was intending to hide behind summons and snipe.
In this second attempt, I managed to get the big croc down to about 75% of full health, maybe a bit more. And I had the 2 small crocs down to barely over 25% of full health. But it felt like the damned crocs had far more hit points than I could ever take out with direct damage magic.
I'm thinking of trying again with Ydwin and trying to have her charm one or both of the small crocs and get them to turn on the big one, since the small ones "only" have an INT affliction resistance, not full immunity. And maybe I could replace Konstantin or someone else with Mirke and when Ydwin has enough focus, cast the Reaping Blades spell on Mirke, since those raw damage blades will obviously ignore any defenses the big croc has.
For what it's worth, I'm not some expert at this game who knows every little edge that can be gains with this potion or that spell, and I'm playing in Normal mode. I mostly brute force my way through nearly all battles and don't mind playing that way. But I just don't see how I'm going to kill these crocs, particularly the big one. I imagine that some of you guys have beat this thing easily, but I'll just be happy to beat it at all.
Any help would be appreciated.