For Kineticist, it is unclear whether a person can stack multiple metakinesis in the same attack.
For instance, a level 9 Kineticist uses Gather Power as a move action to reduce Burn by 1. They then use both Empower and Maximize on their basic blast to do 45+modifiers damage, while taking 2 burn.
Quote:
Metakinesis (Su)
At 5th level, a kineticist gains the ability to alter her kinetic blasts as if with metamagic feats by accepting burn. By accepting 1 point of burn, she can empower her kinetic blast (as if using Empower Spell). At 9th level, by accepting 2 points of burn, she can maximize her kinetic blast as if using Maximize Spell. At 13th level, by accepting 3 points of burn, she can quicken her kinetic blast as if using Quicken Spell.
At 17th level, by accepting 4 points of burn, the kineticist can use her kinetic blast twice with the same standard action, or swift action if she also uses metakinesis to quicken the blast.
When she uses a double kinetic blast, all modifications, such as metakinesis and infusions, apply to both of the blasts, but the kineticist needs to pay the burn cost only once.
