Benefit: The magus can expend 1 point from his arcane pool as a standard action to charge his free hand with energy. He can make a melee touch attack with that hand as a free action as part of activating this ability. If the touch attack hits, it releases the charge and deals 2d6 points of energy damage (acid, cold, electricity, or fire, chosen when he spends the arcane pool point to activate this ability). He can use this ability with the spellstrike class feature. If he misses with this attack, he can hold the charge for up to 1 minute before it dissipates. At 6th level, and every three levels thereafter, the amount of damage dealt by this attack increases by 1d6.
Pool Strike, Arcing
Benefit: The magus can expend 1 additional point from his arcane pool when using the pool strike arcana. If his attack hits, the magus can target a number of enemies within 15 feet equal to his Intelligence modifier (minimum 0) with a ranged touch attack as a free action. Those struck take the same energy damage as the primary target of the pool strike, including increased damage on a critical hit.
I've found a not-detailed interaction that could make worth investing in those 2 magus arcana. I need your help in order to understand if it's legit or not.
The pool strike, Arcing, allow him to target "a number of enemies withing 15 feet equal to his intelligence modifier". There's no limitation about how many time your can target the same enemy, neither that you can't target the same enemy the pool strike was aimed at.
A magus lv12 ( with 5 points of bonus int ) with "Pool Strike" deal 5d6 points of energy damage.
He attack a boss , next to 3 low-level enemies ( a,b,c ). First hit on the boss release "pool strike" ( 5d6 damage ) and activate "pool Strike, Arcing". The magus choose to select 2 times A, 2 times B, 0 times C and another time the Boss. Seven mighty arc of electricity burst out from his weapon right to the targeted enemies.