Rasolo

Rasolo is an NPC you need to talk to as part of the Desert Treasure quest.

He sells various random items, in particular a dragon dagger. He also gives you a ring of visibility as part of the quest, which enables the wearer to see certain ghosts that are otherwise invisible.

He is to be found walking in the area above the dungeon containing the Shadow Diamond for Desert Treasure, west of the Fishing Guild and northwest of Ardougne.