I tried this fight a few times. Got slaugjtered ever yime. The explored the rest of the area and came back when i had done everything else and managed it without to much trouble.

Its doable if youve done the rest first. Ive also strolled past them disguisijg shadowheart as a githjanki (no Laezel in party) and talked myself to avoid the fight. Ive heard others say the same eith a gith PC so non violent options are also possible.

But yeah, the encounters as a whole need some work.