Snail Shaman is part of the snail shaman tribe. His relatives can be found around Hallownest, but since he is bound to the Ancestral Mound he is unable to visit them. He is therefore unaware of their fate.
While the Snail Shaman can create Soul spells such as Vengeful Spirit, he and the other snails are unable to make spells like Abyss Shriek, having never been to the Abyss.
Upon first encounter, the Shaman gifts the Vengeful Spirit spell to the Knight. Accepting it results in the Knight waking up locked up in a small dungeon, tasked with killing an Elder Baldur within the Ancestral Mound.
The bodies of other snail shamans can be found throughout Hallownest. There is a crystallised one in the Crystallised Mound, one with overgrown fungus in the Overgrown Mound and one in the Soul Sanctum that looked like it has been experimented on, as well as a snail sarcophagus where Soul Eater can be found.
Acquiring spells from these snails will cause the Snail Shaman to comment on how these spells remind him of his various relatives.
Oho! Who is that creeping out of the darkness? My, you're looking grim! A strange, empty face and a wicked looking weapon!
Something important has drawn you down into Hallownest's corpse, but I won't ask what. Perhaps the reason you've found me is because you need my help?
Say no more, friend. I'm going to give you a gift, a nasty little spell of my own creation. It's just perfect for a little one like you! Ohoho!
Don't be afraid. Have faith! That spell belongs to you now, all you need to do is take it!
Ohohoho, you won't be going much further without it, I promise you!
After leaving before taking the spell
Oho, you've come back! Didn't you like the look of my gift? You left without saying a word!
Perhaps you're braver than you think! Go ahead and take what belongs to you!
After the Knight awakens
Oho? You've woken at last! I apologise, perhaps I should have warned you about the power of that spell. I was watching over you as you slept, but seem to have slipped away myself! Ohohoho!
Now we're awake, I was wondering whether you would do me a small favour. Not as repayment for my gift of course, simply because we're now friends.
You see, a horrid great beast has made its home in the heart of this temple. Such disrespect! I would be quite grateful if you were to venture deeper in and slay it for me.
It's a hardy creature, but with your new power you're more than a match for it! Good luck with this small favour, my friend! Ohohohohohoho!
What is it? Are you wondering about this gate between us? Ohoho! It's a curious thing, but this door will not open until you have slain that creature lying in the heart of the temple.
Don't worry about it. I'm sure the spirits of my ancestors will be watching over you.
The poor thing! It must have been terrified of you. It used to be quite docile, but the rancid air in these caverns filled it with some ancient rage.
Still, you did what had to be done! You have my gratitude! Of course, we both know you wouldn't have made it through without that spell of mine... Ohoho!
If the Knight did not listen to him after awakening
Oho! There you are! I was watching over you while you slept, and must have slipped away myself. I woke up and found you'd disappeared! You are a surprising one, ohoho!
Actually, I wanted to ask a small favour of you. You see, there is a certain creature lurking just above us, in the heart of this temple...
...Oho? Well, yet another surprise! You've slain that creature before I've even asked!
I scarcely deserve such a friend as you! You're a marvel! Ohohoho!
After gate opens
And look! The gate between us has opened. Ohoho!
I'm sure you're eager to move on. Farewell, and have faith! Whatever you are seeking... it will find you! Ohohoho!
Why do you hesitate? You'll get nothing more from me, I'm afraid.
Though I do admire your persistence! Ohohohoho!
Greeting upon returning
Oho! What brings you back through here, little shadow? Are you lost?
Don't worry about me. I don't need anything more from you. Ohohoho!
Poking around in the dreams of others... You're more curious than you look! Oho ho ho ho!
↑Snail Shaman: "She makes her home beside that Crystal Mount. Leaves quite an impression on those that seek her out. Were I not bound here, I'd love to visit myself."
↑Snail Shaman: "That scream? Ooohh, distorted in such a way... it's not within the skills of us snails to do such a thing. Wherever you draw this new power from, it's not a place my kind ever thought to look."