>> When you think about the amount of unique abilities for the hundred(?) unique characters and how they interact against eachother, the test matrix that result

>> When you think about the amount of unique abilities for the hundred(?) unique characters and how they interact against eachother, the test matrix that results is massive. Definitely. They're at 130 champions right now. Each with four spell cast abilities, as well as a passive ability, and unique auto attack mechanics on some of them. There are indeed many interactions with specific abilities between champions. Add in interaction with the map and terrain itself, like unit collision and NPC minions and monsters. Then deal with the 154 items (the current count on the main map) players can add to their champion, many of which also interact with abilities, and some of which introduce additional abilities. It must be both a nightmare and yet very interesting to handle creating a new champion for the game. Once they get past the step of even deciding how the new champion's abilities should interact with other champions, they then need to code it all and manage to verify that everything works according to expectations. Every once in awhile, there are still bugs with how one ability interacts with another. You can plan it all out, but it has got to be easy to miss something. Too many interactions! :)