Rhys

Rhys is an NPC in the Obsidian Sanctuary, near the Lift Operator. He will give the player access to the Dwarven Mines and Heart of the Mountain, which requires Level 12, in exchange for 10 enchanted ingots of any 3 provided ores. He also appears in Dwarven Village, as a guide to introduce players the Dwarven Mines.

Upon finishing his quest, players will get Heart of the Mountain I, and 1 Token of the Mountain.

Dialogue
Before giving the ores

So you want to visit the Dwarven Mines? You must prove yourself worthy of ... You must bring me some valuable materials that peak my interest. I would like 3 of the following:
 * 10x
 * 10x
 * 10x
 * 10x
 * 10x
 * 10x
 * 10x

After giving the ores

Perhaps you are someone we can get along with after all. I'll get your. It's time for a visit! Let's go together now. For future trips, remember the Lift Operator.

Trivia
Few hours after the Dwarven Mines update, misinformation spread that the NPC was unavailable to take the items and that admins locked the area to fix some bugs. This was debunked as he would take items when the player disabled your Skyblock addons mod.