Grim

You see a grin forming across Grim's skelton face. "Hahaha”, he laughs. "So you decided to stay to help these souls? Good luck you'll need it. The tree is mysterious even to me, but if you touch the trunk of the tree, it will give you a vision that will help. Without this knowledge you will have no hope on succeding as it's tapleafs run deep. Just don't touch it for too long or it will consume you."

"Look, if you don't tell anyone I won't, I'm tired of standing guard here. I want to move on with my afterlife. I would like to give you a glimmer of hope, on defeating this horror, if you sha256 hash the phrase 'sovereignty through knowledge' several times you will have the preimage for the ripemd(g)". If you end up helping enough souls, you should obtain enough information to destroy the tree itself and claim it's bounty.

"ohh, by the way, believe or not, I'm a bit of a tech enthusiast myself, one of the souls told me about Nostr, feel free to give me a follow: npub1kpc5yvvwp5mc576z3se54agngp3g3j0yywh8adwdpy7e2wa7acrs658q32"

You are both impressed by Grim's ability to rattle off his npub and your ability to memorize it.