Game Mode Idea: Beast Hunters!

Basically, this would coincide with a release of new Beast Hunter skins (such as the Beast Hunters Tryndamere, Draven, and Sejuani). You (and 2 other players) could use any human (or humanish) champion, but you have to fight a series of bosses, randomized from this list (you have to fight 3 normal bosses, then 1 "boss" boss): Regular bosses (who have increased size/HP/damage/etc):

• Any of the elemental drakes, with added abilities (for example, it could do a strafing run with elemental breath, or summon elementals of its type)
• Bristle (Sejuani's boar) who dashes around on a very low cooldown, but can also gore and cause tremors (like Alistar)
• Maokai, who is immobile, but throws saplings and uses his ultimate a lot
• Rek'Sai, who burrows underground, warping around the map, and also using her ultimate a lot
• Volibear, who periodically calls down lightning bolts from the sky, as well as inflicts bleeding damage on his auto attacks
• Malphite, who is very slow, very tanky, and damaging him causes shards of rock to rain on the ground
• Skarner, who slashes and crystalline poisons everyone around him, and has very high armor
• Alistar, who periodically roars, causing nearby enemies to run away, as well as shaking the ground around him

"Boss" bosses:

• Baron Nashor (the actual Baron Nashor, not just the one that appears on the Rift)
• Elder Dragon (again, with more, interesting abilities)
• A colossal Aurelion Sol, who comes down from the sky and shoots out stars like there's no tomorrow
• (Others)

Each boss could have its own map, similar to how the Invasion game mode has several areas. For example, Rek'Sai could appear in a desert, Maokai in a jungle, or Skarner in a crystalline cave. There could also be a more difficult game mode with 5 players.