1v1 & 2v2 dungeons with mobs
https://wiki.albiononline.com/wiki/Corrupted_Dungeons
Corrupted dungeons in AO is very nice and could be cool in HB.
Basically random portals opens up around the world, once you enter you get ported to a map with monsters, if another person enters another portal theres a chance he'll get ported into the same map. Once you cleared enough mobs a boss/chest will spawn. Can only be two people in one dungeon. Once you killed ur enemy that ported into ur dungeon or if u port into his, no one else can enter it, so you are free to clear the map. This would be great for people that enjoys hunting but also smaller scale pvp and more fair fights.
Amazing idea, 2-4 members would be nice, i love small fights!