CRITSMITH
Help Log in Start your campaign free Log in Start free

Boss fights: lair actions, cooldowns and legendary actions

Combat · guide 3 of 3

A boss fight has more to remember: lair actions, abilities that recharge, and legendary actions. Critsmith keeps count of all of it, so you can focus on the drama.

Lair actions

On the boss's card, press Set as lair holder. The card is tagged lair holder, and its lair actions appear inside it.

The lair actions inside the lair holder's card, with when each unlocks

Lair actions come from the NPC's page or a homebrew monster, so they're ready in every fight. Or add some just for this one, under Lair actions for this fight.

Lair actions for this fight, each with when it's available

Each can be always available, only once the boss is bloodied, or only from a set round. Until then, it's greyed out and says when it unlocks.

Once the fight starts, the tracker counts the turns to the lair action at initiative 20, so you never forget it.

The countdown to the next lair action

Abilities that recharge

Abilities with a recharge, like Ember Breath, show as ready. Press it when the boss uses it, and it's marked used.

At the start of the boss's turn, press Roll recharge. Critsmith rolls the d6 and tells you whether it's back.

Ember Breath used, with Roll recharge beside it
The recharge roll's result

Cooldowns

Cooldown abilities you've written on an NPC or homebrew monster work by rounds. Press one when it's used, and it counts down each round until it's ready again.

Smoke Veil used, counting down the rounds until it's ready

Legendary actions

Legendary actions show how many are left this round. Press one to spend it, and when they run out, the buttons switch off.

They come back by themselves at the start of the boss's turn, or press Give them back.

No legendary actions left, with Give them back

Every recharge and countdown is tracked, so you never lose the thread.

‹ PreviousRunning a fight
All help guides
CRITSMITH

Built on the System Reference Document. Independent, not affiliated with or endorsed by Wizards of the Coast.

© 2026 Critsmith