Baldur's Gate 3 - Astarion Monk vs Gortash on Tactican

Not monk specialist, but wanted to make a quick build, becouse flurry of blows looks so cool. Feat: Tavern Brawler. Potion that sets STR to 27. Ascended Astarion adds 1d10 necrotic to each punch. Dont need full Illithid Power Tree, just wanted to make Cull the Weak passive ability stronger.