Being able to trade monsters and items. Such as ruins and any other item. Trading monsters if one is more valuable then the other the traders have an option to add items and gems to sweeten and even the trade.

@grogden Liking this idea a lot

@grogden this kind of idea has been suggested multiple times. Great from a players point of view specially for players with multiple accounts. Imagine players with 3, 4 or more accounts how they can benefit from this.
Also how do you determine the value of a monster its not straight foreward like a legendary is more worth than a epic, I would prefer a Nautilus (epic) above a Hayman (legendary) - a 7 team speed rune above a 8 team stamina rune - a gold charging banner above a diamond Baltasar mask.

My last point against this,exploit of players now in race we have leads that ask gems from players use them than kick them imagine if you want to be part of a team you have to "buy" your way in with a rune, relic, monster you get a bad one the lead gets your good. Also "newbies" can be exploit by more knowledgeable players