Guild Wars 2

How about a vendor gets implemented in the home instance, that will give you upon request a item that creates a bundle, the bundles availible would be based upon personal story: did you go for tanks/mortars or for the cauldron, did you get the anti dragon magic gun, etc; and slayer achivements: e.g. a litospheric subwoofer that you get for killing dredge that lets you once a day melt the brains of all dredge within a 3kradius and stop their respawn for 10 minutes, a centaur tribe altar that makes all centaur witin 3k remember their family bloodlines and overall causes them to be hostile between eachother, a electrostatic harpoon rifle that does 3x normal damage of your underwater weapon to sharks and jellyfish, stolen flame legion effigy dolls that burn foes around em and siege damage to icebrood and plants, etc;
Ofc all would need pretty massive cooldowns and unable to chain used in the same zone, but it would give us a reason to return to the home instance, make some choices actually make a difference, go for the slaying achivements and god knows how many other implementations just for lolz.