To breathe, Arad conjured wind using magic directly in his mouth and breathed it, and when he got used to that, he started generating the air deeper and deeper until he was able to make it right inside his lungs.
He didn't need that much volume of air to survive, so it cost him barely anything. The only problem he faced was keeping a steady rhythm. He needed to synchronize generating air with his chest expanding so his lungs won't be torn under the pressure.
Since the seawater wasn't getting into his lungs, he could easily keep doing that and breathe, solving one of his biggest problems, and now, it was time to solve the next one.
If mana couldn't leave Arad's skin due to the water blocking it, then he only needed to keep it inside his body, beneath his skin. There weren't that many spells that would work, and most would only cause his body to explode from the inside out.
