This little idea that could be found in the Training Hall as a sub-area for each player. One can choose any monster in any tier and/or any family they want to slice or shoot at to build up a strategy. The amount can be from 1 to 5 of a single monster.
The disadvantages are that a knight cannot generate a monster that he/she did not encounter in the Clockworks and they don't gain any heat or crowns when defeating a monster.
Spawn vanas every day
Though the idea itself sounds nice, it could be useful for those poor people (me) without the monies to buy the guild training hall