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.
"Those struck take the same energy damage as the primary target of the pool strike, including increased damage on a critical hit. "
Let suppose the magus release his first pool Strike through is spellstrike class feature, threatening on a 19-20/ x3 .
The first attack is a critical Hit ( confirmed!): the magus deal his "pool strike" damage empowered by the critical. This should mean ( regardless of the critical score of the weapon ) a 5d6 + 5d6, a 10d6.
The creatures struck by other " arcing bolts" are subject to "ranged touch attack", this mean that even those attack could crit on their own.
Which scenario should be intended with a critical hit?
On the first enemy - you roll a 1, not enought to hit, the first arcing bolt is wasted. On the second enemy - you roll enought to hit him, you deal 10d6 ( the same increased damage on critical hit ) . Versus the third enemy, the unlucky one, you roll another natural 20 (*).
He get critted for .. a) 10d6 + 5d6 b) 10d6 + 10d6 ?