Swallowed Whole

In my potions? A bit of this and that. Well decidedly more of certain thises than that's... but what brings you to my shop? A Draught of Recovery is it? Well, well, well... no, no I have the skill. It's just that I'm afraid I've run out of the most important ingredient, and I haven't the time to fetch more, what with so many orders to fill. But if you've the time to procure it for me, I'd make the draught for free! You'll have to head into the Burrow for it. Take this vial and fill it up with the green fluid oozes from a Bilerot Nurgling. Might not look like much but I assure you it is quite potent enough for our purposes.

Make your way to the entrance of the Bilerot Burrow near the Monolith in the Inevitable City. Enter the dungeon and gather some samples of the putrid filth oozing from a Bilerot Nurgling with the Glass Vial. Return to Calvius Blisterbra.