Whistle

• Type: Attack
• Cost: 3
• Rarity: Ancient (Colorless)
• Effect: Deal 33 damage. Stun the enemy. Exhaust.

Upgraded

• Cost: 3
• Effect: Deal 44 damage. Stun the enemy. Exhaust.

An Ancient Attack with top-tier single-target removal — 33 damage plus Stun on one card. A-tier. Stun completely skips the enemy's next action, so you neutralize critical attacks from bosses and elites while landing heavy damage. Upgraded hits 44 damage, taking half the HP off mid-act elites in one card. Exhaust means once per combat, but that single use swings the fight massively. The only weakness is cost 3 — without Energy support you lose the ability to play much else that turn.

Most effective when timed against enemy big attacks or buff turns. Stun skips their action while you push 33 damage through — the move is both offense and defense. Cost 3 restricts other plays that turn, so either use Brightest Flame / Enlightenment to support Energy, or commit to an all-in first turn. Echo Form's double trigger delivers 66 damage + Stun, sinking most elites in one turn. Since it Exhausts, save it for a decisive moment.

• Echo Form: double trigger for 66 damage + Stun. Even on bosses you can unload huge damage in one turn.
• Enlightenment: drops Whistle's cost to 1, freeing you to play other cards in the same turn.
• Brightest Flame: +2 Energy / +2 draw covers the cost 3. Enables Whistle + other plays in one turn.
• Vulnerable: Whistle on a Vulnerable target hits for 33 x 1.5 = 49 damage. Upgraded reaches 66.
• Necronomicon (Relic): auto-plays cost-2+ Attacks twice. Whistle becomes 66 damage + Stun.
• Feeding Frenzy: +5 Strength this turn pushes Whistle to 38 damage. Upgraded reaches 49.