Feat: Spellshifter Dedication
You can exert your will over magical spells cast in your vicinity, potentially altering or controlling their effects. You accomplish this through the use of a spellshifting conduit, a magical object of your choice that has light Bulk and can be held in one hand. If your conduit is lost or destroyed, you can train yourself to use a new one by spending 10 minutes attuning yourself to it. You gain the Shift Spell action and the Share the Burden spellshift.
Spellshift—Shift Burden You share the burden of a spell, allowing you to share control with the caster. If Sustaining a spell with this spellshift causes a creature to attempt a saving throw, it is attempted against the higher of your class DC or spell DC. If the spell requires a spell attack roll, make the attack using your Arcana modifier instead of the spell's normal spell attack modifier.
Critical Success If the spell is sustainable, you can Sustain the spell as a free action as though you had cast the spell. For the remainder of the spell's duration, you can Sustain the spell as though you were the caster.
Success If the spell is sustainable, you can Sustain the spell as a free action as though you had cast the spell.