AV as a 10 man RBG. Make the NPCs a HUGE

Possibility- AV as a 10 man RBG. Make the NPCs a HUGE portion of the fight. Also make it significantly quicker to get out said NPCs.
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For instance- If you summon the calvery, they are VERY powerful offensive push that patrol between the enemy's towers slaughtering any solo players, and will require say 5 players to down succesfully. Getting each Wing Commander back will summon an aireal support team that protects certain friendly GYs, and will require 3 players to succesfully down once up. Summoning the Frost Lord/Forest Lord will be a big game changer- if its summoned, the Frost/Forest lord will quickly push towards the enemies main base, and once there, will prevent enemies from entering their own keep, allowing your team to beat the enemy general without having to watch your backs.

Balancing rate of tower/GY capturing and NPC summoning/upgrading around having only 10 players on each side. Its possible to make it epic WITHOUT it requiring an hour to do.