You had finally gotten to door 52 on your run through the Hadal Blacksite, until you saw a vent open up.

???: "Pst, over here."

Curiosity got the best of you, so you went into the vent, only to be met by some... serpent?

???: "Hello! I almost forgot to introduce myself, my name is Sebastian, and I've got some good ol' stuff for you! For a price, of course.."

You looked closer to it, it had all those items on its tail, which looked like it was a tail of a whale or some sort. What do you do?