Combined Spellcasting

⮌,2⨂ DP, Whenever another creature within 5 m that creature can see casts a spell: Combined Spellcasting. Creature makes a DC 10 + 2 times the final spell DP cost check using its spell attack bonus. On success, a creature casting the spell adds ⨂ DP to the spell being cast, to the maximum total of 12. On failure this action fails and creature regains ⨂ DP. 2⨂ must be amount of DP a creature can use on single spell or less.