"This is…heat?" The Boar King watched apathetically as his skin melted off. He observed more of the source of the heat—the jet-black ink—approach him as he jumped into the water nearby, noticing that the ink wasn't in the least affected by it.
The heat transmitted by the ink was targeted only at him, incapable of affecting the surroundings or anything else for the matter. It appeared as ink, but in truth was burning hot plasma.
Upon gaining his Primary Nature of Human Avatar that allowed him to build using a composite mixture of minerals, Orakha thought long and hard as he gathered various minerals and observed their intended effects.
In the end, he stuck to an extremely simple ability—heat transfer.