Ability???.
The reason Alec no longer referred to it as a Mana pool again was straightforward: he had obliterated it countless times while practicing the latest technique from the book passed down by the patriarch of the Gordons clan and now his body is no longer restricted to a small pool but now his hole body was acting as his Mana pool.
But he did have the system’s assistance which was why he had survived such an experience,
But the reason Alec’s had been quick to catch on was largely due to his deep familiarity with the two particular runes, the earth rune, in the middle had a sign shaped like a bullet, and that is when he realised ; these runes were the manifestation of his innate spells when he advanced to Tier 2.