First round I had the party hang back and let the Harpers take the hits. My MC drank Haste and threw 4x smokepowder bombs into Z'rell's group, Karlach and Gale attacked at range, SH buffed.

Second round Z'rell fell, Karlach jumped onto rafters (Str20 + Athlete feat) and threw enemy archers down on foes. Gale went CC with Black tentacles. SH mass healed, and MC did Lay on hands on Jaheira (she had gotten badly injured).

Third/fourth rounds we wrecked the enemy backline spellcasters and fight transitioned to mop-up.