Related: Pathfinder Damage Dice Steps
Spheres of Power (SoP) is an alternative/expanded magic system for Pathfinder. The destruction sphere gives the caster access to an unlimited ray attack which can be expanded on in many ways by different talents.
There are many talents which change the damage the blast can deal, either by increasing or decreasing the size of the dice. Specifically there is a talent called Greater Blast. Since this is applied without using a shape or type its good.
The damage of your destructive blast increases by one die. You may take this talent an additional time at 5th caster level and every 5 caster levels thereafter; the effects stack.
At the bottom of the destruction sphere page under wild magic it lists
Increase the effect’s damage die size by 1 step (1d4, 1d6, 1d8, 1d10, 1d12).
Since the base blast does 1d6, the first time it’s taken it increases to 1d8, and the second time to 1d10. Both sources agree to this point. It’s what happens after that’s not clear. Does it become 1d12 as suggested by the wild magic table which is not the specific source as wild magic is different from the blast? Or should I strictly follow the damage die progression chart and deal 2d6?