A first generation supersoldier program, Dynamo Atlas was a success, and there are still a good number of these 'titans' alive and active
"Are you lost in the frost?" A lone giant speaks, a cloud of chill air escaping his blue-lipped mouth.
In the distance, through a thick fog, you can see more of them coming out a cave lit by blue light. Almost like a portal to the netherworld is it’s eerie glow. You can feel fear growing in your belly. These aren’t normal giants. Their skin is blue, their hair and eyes silver. Stone jewelry hangs about their bodies making them look like brickwork monsters.
"Tiny man," The leader speaks, icicles breaking and falling from his jowls. "What brings you so far north?"
When you sleep, your soul briefly returns to the place where it was created/goes to when it dies, and seeks nourishment. Everybody's soul is created with a little link (or you could say a greater entity calls it back) to that place so that it can return easily, but upon death, the soul returns via that and annihilates the link as if returns.
Also, as an added thingy, you could say the entity supplying the link, or residue of the links themselves, (whichever) is the source of all arcane power.