The Mask of Kelvin is a Mission in Dark Alliance. The Mask of Kelvin becomes available once you complete all three acts of The Goblin's Shard, Verbeeg Jamboree and The Order of the One Light. Missions in Dark Alliance need to be completed in order to progress the story forward. You can obtain more and better loot as you complete more Missions.
Missions in Dark Alliance are divided into three different Acts. Once you complete an act, the next one becomes available. When you complete all three acts, another Mission becomes available.
The Mask of Kelvin
Mission Briefing
A frost giant named Utaar is attempting to break into Kelvin's Tomb and recover an artifact that he believes will help him find and claim the Crystal Shard
Preferred Gear Set Drop
♦ Battlehammer King Set (Bruenor Battlehammer)
♦ Barbarian Diplomat Set (Catti-Brie)
♦ Remorhaz Brotherhood Set (Drizzt Do'Urden)
♦ Flag Bearer Set (Wulfgar)
Unlocks
Once you complete all three acts of The Mask of Kelvin you unlock the following Missions:
The Mask of Kelvin Acts

Ghosts of the Past
Kelvin's Cairn was named for the great frost giant king of old who was buried beneath it, so the legend told.
Utaar was one of the few remaining frost giant kings of Icewind Dale. He had delved deep under Kelvin's Cairn and broken the seals set by the clerics of Tempus on the Tomb of Kelvin.
Utaar's actions had disturbed the dead, and we would have to lay them back to rest before following Utaar into the catacombs of Kelvin's fallen city.

The Broken City
Utaar sought the Mask of Melvin, believing that the artifacts of his forefather would help him recover the Crystal Shard.
To catch up with Utaar, we would have to pass through the shattered remnants of the Broken City.
But navigating to Kelvin's Tomb would be a challenge. We would need to recover the Netherese Keystones to activate the portal that would take us there.

The Face of Kelvin
None could say what damage Kelvin's spirit would do if it was unleashed upon the Dale.
And so we delved into Kelvin's Tomb ourselves, seeking out Utaar so that we could put a stop to this madness.
But none of us were prepared for what we found there waiting in the dark. Who knew the call of the Shard was so strong.