User blog comment:Poisonshark/Custom Champion, Eranus, the Light of Ancient Times/@comment-7709681-20140825235152

"Unlike, Stellar Energy will go on cooldown as it is used, not as the basic attack is performed. It is therefore possible to use a double Stellar Energy." - That doesn't make sense, in such case the buff's duration would be refreshed, not making the buff stack with itself.

Additionally, would be horrible to deal  (197.6 + (16.8 per level), up to 500), or worst,  with  (296.4 + (25.2 per level), up to 750) every 1.5 seconds... and heal from either half or the total damage dealt by Stellar Energy (Aswell as stacking with other sources of Lifesteal, plus  that benefits from Lifesteal).