Unlike the Special Supreme-ranked talent, the normal talents like [Battle Axe Mastery] didn't have any additional requirements other than spending the [Supreme Promote Points].
The only thing that Leo lacked right now was the [Supreme Points] as he had already accumulated more than two million [Supreme Promote Points] by killing the supreme-ranked dragons.
'Ding,
The host spent 10000 [Supreme Promote Points] and upgraded his talent [Battle Axe Mastery] to level 4.
'Ding,
The host spent 100000 [Supreme Promote Points]...
'Ding,
The host spent 200000 [Supreme Promote Points]...
'Ding,
The host spent One million [Supreme Promote Points] and upgraded his talent [Battle Axe Mastery] to level 7.
Leo made his decision to upgrade the [Battle Axe Mastery] from the beginning and he was waiting for the right moment while accumulating the [Supreme Promote Points].