Monsters should be able to be selected and have variations applied to them

[BryceDMonaco]

Variations are to normally non-changeable stats. For example, selecting a group of goblins and changing their health by a random value between [-2, 2] individually.

[BryceDMonaco]

Applied needs discussion label because, as a DM, I have not really modified monster stats more than once or twice. While the random variation might be useful, if a DM wants a custom version of a monster, they should just add it as a new entry to MonsterCSV.csv.