User blog comment:Emptylord/Archived/Oberon the Faerie King/@comment-124.149.187.59-20121211110501/@comment-1330314-20121211115418

Answering in Emptylord's stead:

1. This is an entirely new champion idea. The design is inspired from Dota's Invoker, but from what it seems every ability is different to the original's.

2. This is nothing like Sona. Sona has auras, Oberon has wisps which act as configurable pets. His basic abilities don't have an effect on anyone but himself, either.

3. The best would be for you to look at Invoker's page, though Emptylord said Oberon's ult works slightly differently. Basically, when you have three wisps, the configuration you get (triple fire, double water and one earth, one of each, etc.) determines what spell gets cast when you cast your ult. The wisps are basically reagents and the ult "combines" them (without affecting them) to produce one of ten spells, each with their own effects and cooldown.