In one of my recent games a friend brought an enlightened fist (Complete Arcane) to the table: while I'm glad he is showing to like it, I also think to understand where the build is pointing, and although this is perfectly fine I have to admit I don't know exactly how to behave when his unusual class feature (hold ray) will start to interact with split ray.
Split ray: You can cause any ray spell to fire one additional ray beyond the number normally allowed. The additional ray requires a separate ranged touch attack roll to hit and deals damage as normal. It can be fired at the same target as the first ray or at a different target, but all rays must be aimed at targets within 30 feet of each other and fired simultaneously. A split ray spell uses a spell slot two levels higher than the spell's actual level.
Hold Ray (Ex): At 7th level or higher, an enlightened fist can cast any spell that produces a ray effect as a touch spell instead. The spell's range is reduced to touch, and its Effect entry is replaced with "Target: Creature touched." She can deliver the spell with a touch attack or with a normal attack, and she can hold the charge as with a normal touch spell. An enlightened fist can combine this ability with arcane fist (see above) to deliver a ray-effect spell as part of an unarmed full attack action.
Arcane Fist (Su): Beginning at 3rd level, an enlightened fist can spend one of her daily stunning attempts to cast and deliver a touch spell as part of an unarmed full attack action. She can choose to deliver the touch spell with any single unarmed strike attack she makes during the action.
So let's say this enlightened fist uses Enervation (ray, 4th level) but as a splitted ray spell, effectively using a 6th level spell slot. And assume he wants to deliver it as part of a full attack action. How to handle it? Does he deliver a "ray" each meelee attack until discharged, or both with one attack? And if so, the extra ray must be rolled after the fist attack, separated from the rest of the attack rolls?