Baldur's Gate 3: Assault Moonrise Towers in BG3 - walkthrough Baldurs Gate 3 guide, walkthrough
Fighting Ketherick Thorm in BG3 is not the easiest thing to do. In this guide, you will find tips on how to Assault Moonrise Towers - Jaheira, Isobel, Nightsong, end of Act 2.
Last update: 31 May 2024
After meeting the Nightsong and acquiring Ketheric Thorm's relic in BG3, you'll need to assault Moonrise Towers. We describe the battle against Thorm and explain how to acquire allies for the finale of Act 2 - Isobel, Jaheira and the Harpers
Allying with Jaheira
After searching the Gauntlet of Shar and finding the Nightsong, it's finally time to defeat Thorm and the Cult of the Absolute. After leaving the temple, talk to Shadowheart if she's in your party. Return to camp and take a long rest. Next, fast travel to Moonrise Towers and talk to Jaheira.
It's time for a battle. If you've failed to protect Isobel, you'll be on your own, making it even tougher. Jaheira will join your party, being of great help.
If you have the Harpers with you, the fight should be manageable. If it's just Jaheira, you'll need to use all the tricks up your sleeve to prevail. Use oils, scrolls and grenades. Wild Shape always fully restores Jaheira's health, making her a really good tank. Focus on Z'rell, then on the sharpshooters on the wooden beams above. If you've helped the gnolls in a side quest, they'll fight at your side.
After the battle, talk to your allies and go upstairs, triggering another battle. Eliminate the enemy spellcaster first. If you've failed to protect Isobel, there'll be another enemy here too. After beating them, go up to the roof.
Fighting Ketheric Thorm
You'll face Thorm in a cutscene - you can try to convince him you'll show mercy, or attack outright. This choice may matter later on. Defeat Thorm's minions. The leader will escape once his health gets low enough. After the cutscene, finish the fight.
Search the corpses and enter the hollow tower. This will take you to the Mind Flayer Colony.
As you make your way through it, you'll eventually reach an elevator, leading to the final battle against Thorm.
Descend atop the elevator and walk through the gate - this triggers a cutscene and a conversation with Thorm. If you thoroughly examined his room, tried to show him mercy and saved Isobel, you can convince him to surrender. This skips the entire first phase of the fight.
Otherwise, prepare for a challenege - Ketheric is immortal as long as Aylin is contained. Your primary objective is to save her and eliminate Thorm's minions.
The boss himself isn't too threatening at first. Kill the Mind Flayer before helping Aylin, as it can dominate her and bring her to its side. After killing the Mind Flayer, take down the remaining minions and Thorm himself.
Defeating him triggers a cutscene and starts the second phase. You'll face the Apostle of Myrkul, resistant to cold, poison and necrotic damage. Casting Haste on your primary damage dealer should burst him down quickly.
End of Act 2
Defeating the Apostle triggers a cutscene. You'll speak to the Dream Visitor and leave the area with a new objective - head to Baldur's Gate, kill Gortash and Orin, then take their Netherstones binding the crown.
After talking to your allies, head to the passage at the west of the map - go to Baldur's Gate to finish Act 2.