To upgrade a power you first need experience points (xp), you gain xp by defeating enemies & by breaking sarcophagi see the ‘Got Walkthrough’ trophy below for more information on sarcophagi.
There are four powers in total, they are:
– Stone Power
– Flame Trail
– Ice Blast
To enter the upgrade menu simply press . In there you can see that each of the four powers has 4 slots, so you will need to upgrade one of them 4 times until it reaches its maximum. Each upgrade will cost you 300 xp so in total you will need 1200 xp.
I personally recommend you start upgrading the Stone Power ability as soon as possible, it will help a lot in achieving the ‘Untouchable’ and ‘invincible’ trophies later in the game.