The Wicked Herbalist Tomb

Two tall and dusty doors open to you all, reveling a staircase that decends. Eventually, the light of your torches vanishes, you fail any attempt to light it back on. A strange voice can be heard from here.
Sounds of a mouth made of bones, talking, mumbling, maybe alchemical formulas?

Why are you even here? d6:
1 - Heard about this place by an old man, who said to be the Herbalists Apprentice.
2 - Found it by an accident.
3 - Imnsoniac on a tavern, you forced yourself to sleep, around 2 hours in and you waken up in front of the doors.
4 - Found an old torn piece of paper with it's location.
5 - The Herbalist itself invaded your mind, asking politely for you to free his soul.
6 - You don't know how you endend in this place, sometime ago you simple started to run towards here.

Yes, this is a Mörk Borg dungeon for your players to die in. My first ever dungeon for the game, so please, adapt it as you like, make it better!