Effects which grant extra attacks/actions outside of normal turn sequence (for e.g. counterattacks)
Temporary effect-handlers (e.g. for one round, when this happens, do that)
Commands that cost resources -- don't allow selection ifinsufficient resource.
"run away" status -- if a character or monster runs away, they no longer participate in battle and can't be targeted, but aren't dead. If all combatants on one side are dead or run-away, end the fight immediately even if it's the middle of a round.