Larian Studios Forums Baldur's Gate III Baldur's Gate III - Suggestions & Feedback "Tutorial Act" NPC's - Mindflayer & Demoncommander

There are a few ways to beat them.

You can bring every single explosive canister into the room and chain detonate them to get them all in one go. Sometimes it takes a few extra explosions, you "can" drop items that counts as no action to keep detonating throwables to keep doing dmg in one turn.

Also if you park one of your party outside next to a regeneration station, you can use that to heal your party in combat to full, even if they are downed.

You can kite the npcs, up and down stairs and jumping over edges so they have to path further before reaching you and again using explosives (more reliable than attacking directly because the AC is so high and you do so little dmg to them).

My personal tactic is to block out the 2 adds that come down the hallway midway through the fight, detonate those two and then rely on "help" function to keep standing my downed ally up when face tanking the commander by himself.

One time I created a barricade at the top of the stairs and they couldn't path to me or jump, so I just shot them with arrows for a few minutes till they died.

By killing them all you level up as soon as you touch ground on the beach. All three of them have greatswords, the mindflayer had nothing.

There is a console at the back of the room, behind the navigation device that has interactable buttons (like the ones that made the human's aggressive where shadowheart is held) but at this time they do nothing.