Good strategy for Ketheric Thorm?

[Quadsword]

I beat Ketheric Thorm in the Illithid colony, but it was a lot closer than I wanted. I had to use revivify on Astarion after Nightsong double crit-smited him while under domination, and ended the second phase with Karlach and Shadowheart unconscious. I probably would have just lost the fight outright if it was tactician where everything hits harder and has more HP.

[jennireneex]

Helps if your first feat for everyone was Alert to get initiative.

I like to invis and send a person running to free the Nightsong and then a 2nd invis on someone to attack the mind flayer (have to use someone that can jump up to that platform). Then while they are running to spots invis a caster and go in and drop a fireball on the Necromire group. Depending on how fast I am going, either the invis wears off on the one going to Nightsong or the fireball goes off and battle starts.

Clean up the brains with whoever gets free to drop an AE on them.

Then next priority is to get Silence cast right over the Pit and as much of the platform as I can.

Speed potions to get as many attacks as i can.

Tactician is a bit more busy with extra adds, but still that basic beginning strat seems to work well for me.

[ToucanSafari]

Use a fighter with an adamantium longsword.

[Vλgaβoηđ]

Did this on balanced and Tactician with additional self imposed RP limitations.
Tav (Vengeance Paladin/BM Fighter)
Shadowheart (Life Cleric, Spared Nightsong to justify respec)
Wyll (Picked him only for the Rapier)
Astarion (Gloom Assassin) 5 Gloom Ranger, 5 Assassin Rogue

Here is the deal. You can skip the first phase with Persuasion dialogue (and its honestly best if you do that). Therefore you immediately get an immobile enemy (Acolyte of Myrkul).

Now, you need some pre-combat prep. Your 4 key things that you need is an Elixir of Vigilance and Bloodlust, Dimension Door and a Poison of Paralysis (Karabasan's Poison or Crawler Mucus).

1)Before you initiate dialogue, make sure Wyll (or any other spellcaster) drinks the Elixir, it gives =5 initiative, which should be enough to get first turn (most important part). While Astarion drinks Elixir of Bloodlust.

-You should get Astarion and Wyll going first, which is key-

2)Use Dimension Door and send your spellcaster with Astarion to Nightsong.

3)While near Nightsong, make Astarion coat his bow in the Poison and kill one Intellect Devourer with the Gloomstalker free attack.

If done correctly, then you have two actions, no bonus action and one dead Intellect Devourer.

4)Use Help to free Nightsong.
5)Use your second action to attack the Mindflayer. If you have Arrow of Many Targets, use it, the poison spreads to additional targets.

After these steps Nightsong is free and attacks the Acolyte, Mindflayer is paralysed and you have basically control all major threats.

Now you just need to kill the skelly boys to the left, Flame Strike from Shadowheart helps immensely, as do Smokepowder Grenades. While Astarion kills the Mindflayer, Wyll or your spellcaster finishes off the IDs and whatever else your action economy affords.

After MF, IDs and the Skeletons are gone, Acolyte is just a number waiting to be withered down to 0. Life Domain Shadowheart is a backup in case someone goes down.

[plasticsoda]

Originally posted by Quadsword:

I beat Ketheric Thorm in the Illithid colony, but it was a lot closer than I wanted. I had to use revivify on Astarion after Nightsong double crit-smited him while under domination, and ended the second phase with Karlach and Shadowheart unconscious. I probably would have just lost the fight outright if it was tactician where everything hits harder and has more HP.

keep attacking until his health goes down

[victorvnv]

Idk I always kill him before he makes a move, what exactly do you have issues with ?

[GayBeard]

You can actually skip this fight completely and only fight the Avatar of Myrkul. If you've read enough lore about the curse, his wife and isobel, you can convince him into redeeming himself and like every other act 2 boss he can kill himself, jump intot he void and you only fight Myrkul. Maybe this will help in future runs!

P.S. I do remember the checks being slightly high for that so use a charisma character

[Rabbit]

Originally posted by GayBeard:

You can actually skip this fight completely and only fight the Avatar of Myrkul. If you've read enough lore about the curse, his wife and isobel, you can convince him into redeeming himself and like every other act 2 boss he can kill himself, jump intot he void and you only fight Myrkul. Maybe this will help in future runs!

P.S. I do remember the checks being slightly high for that so use a charisma character

I've found skipping to Myrkul makes the fight HARDER. At least when I did it, he jumped in and skipped to Myrkul... with nightsong still caged, the mindflayer still on a tear, and the full array of starter skeletons around. I use stage 1 to clear all the fodder and free nightsong and it makes myrkul a lot easier

Additionally I find it harder because if Myrkul doesn't have a melee target, he does a powerful move where he damages and yanks every character closer. If you skip to phase 2, you're all still very far away and Nightsong isn't there to be the bait either

[Pan Darius Cassandra]

The best strategy is to win.

[Edstyles]

Suprise attack . Murder all his adds . Then focus boss with ranged . If yoi can CC him thats Great. Then big boss have the meele stand in different places.
Have summons as cannonfodder then kill. I took 0 damage in tactician

[[Countess]Vol†z]

Originally posted by Edstyles:

Suprise attack . Murder all his adds . Then focus boss with ranged . If yoi can CC him thats Great. Then big boss have the meele stand in different places.
Have summons as cannonfodder then kill. I took 0 damage in tactician

Basically this, I killed the Illithids with sneak attack Astarion on the right first. and freed Aylin with miststep with Tav. Shadowheart used spirit guardians on the left side of Avatar of Myrkul and as he sucked in undead they got fired by the guardians. Lastly I had a Paladin of Vengeance Karlach smite him with a haste potion a bunch of times. He was dead in 3 turns on Tact.