I will have to go into some custom games and toggle some of the options to keep an eye on the lifegain from spellvamp... Ill let you know later what i find out. But thanks for taking this seriously and not being an *** about it ROFL

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The amount of health restored with Spell Vamp follows the following formula:
Health restored = total spell damage × spell vamp × vamp coefficient
where
* Total spell damage is the the mitigated spell damage done to every target affected, and
* Vamp coefficient is 1 for single target spells and 1/3 for multi-target spells.
ExamplesEdit
Assuming targets with 0 pertinent resistance (armor for physical damage or magic resistance for magic damage):
* 25% spell vamp on a single-target spell that does 100 damage will return 100 × 0.25 × 1 = 25 health.
* 30% spell vamp on an AoE spell that does 100 AoE damage to each of 4 targets will return 4 × 100 × 0.30 × (1 / 3) = 40 health.
Still not ENTIRELY specific, tho it leads towards your argument... guess i HAVE to go in and test it myself. Damn, thought this was gonna be easy lolz. "multi targeted spells" including AOE spell cast or damage is still up for question. Certainly seems like Karthas Requium WOULD be considered a "multi targeted spell" since it SPECIFICALLY targets enemy champs, however AOE such as Mord Siphon of Destruction is still up for debate. Hmm. Craaaaaap, looks like i haz to do math nao...
Health restored = total spell damage × spell vamp × vamp coefficient
where
* Total spell damage is the the mitigated spell damage done to every target affected, and
* Vamp coefficient is 1 for single target spells and 1/3 for multi-target spells.
ExamplesEdit
Assuming targets with 0 pertinent resistance (armor for physical damage or magic resistance for magic damage):
* 25% spell vamp on a single-target spell that does 100 damage will return 100 × 0.25 × 1 = 25 health.
* 30% spell vamp on an AoE spell that does 100 AoE damage to each of 4 targets will return 4 × 100 × 0.30 × (1 / 3) = 40 health.
Still not ENTIRELY specific, tho it leads towards your argument... guess i HAVE to go in and test it myself. Damn, thought this was gonna be easy lolz. "multi targeted spells" including AOE spell cast or damage is still up for question. Certainly seems like Karthas Requium WOULD be considered a "multi targeted spell" since it SPECIFICALLY targets enemy champs, however AOE such as Mord Siphon of Destruction is still up for debate. Hmm. Craaaaaap, looks like i haz to do math nao...

Hey, if you liked any advice i gave, be sure to +rep me! Oh, and check out my Shaco and Maokail lorecraft in my Blog! I'm a starving artist in need of attention, so please feel free to read, respond, and critique me! Please? Anybody that leaves a comment (good or bad) will receive a +rep!
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If you have any proof it works differently then share it by all means. :P