The format will be nothing like the one we had before (because apparently, it's too complicated for most clans). It's basically a knockout tournament now, a clan will vs another clan and the overall winner will get to the next round all the way up to the finals. Think of it like Champions League after group stage or really any Cup style tournament in sports.
The competition itself will be 1v1s only, either 7 (in case the winning clan goes 7-0), but if the other clan even gets 1 win it'll be best of 13. Every player can play 1 slot in the initial 7 templates and another slot in the remaining 6. You can sub out every slot ONCE during the entire event. Since Lu Fredd won CBII, we'd have the highest seeding and will face vs the lowest (either last clan in div C or lowest seeded new coming clan).
Third placed clan can add and remove 1 template from the pool, second placed clan can add and remove 2. The winner can add and remove 3 templates. Season 4 primary and secondary templates would be randomly pulled from the template pool.
