Many know cloud giants as the most mystic of all the true giants. However, there is another kind of giant that eats, sleep, and breathes the arcane. The mercury giants are ancient scholars and practically bleed arcane energy with how often they expose themselves to it. Ancient Arcanists. Mercury giants have crystalline looking eyes, grayish-pale blue skin, and pale purple hair. Their arcane skill is the only thing that makes them intimidating, as hill giants stand eye to eye with them.