Monster abilities implement levelRequirement

[tjheslin1]

Abilities must implement a levelRequirement, however monster specific abilities such as mutliAttack have no use for the levelRequirement field as Monster has no concept of Level, instead implementing a challenge rating.

There is unlikely to be any ability used by both Players and Monsters. Likely a separate implementation is more appropriate (e.g Extra Attack / Multi Attack).

One possibility is to drop levelRequirement from Ability. This is undeseriable as it's main usage is to remind the developer to implement this and consider it.

Another option is to have a Level to represent Monsters (e.g LevelZero), however this will cause issues when pattern matching over levels (see Cleric#clericSpellSlots) where this would not make sense.