Slay the Spire 2 Frail Status — 25% Less Block Explained

Frail is the defensive debuff: "Gain 25% less Block from cards for X turns." While it is on you, every block number printed on your cards is discounted by a quarter — and the enemies that apply it are timing it for their biggest swing.

How it works

• The discount is fixed at 25% — additional stacks extend the duration by a turn each, they do not deepen the percentage.
• Rounding is downward: 5 Block × 25% = 1.25, so you lose 1 and keep 4.
• Cards only. Block from relics, potions and other non-card sources is untouched — only the printed numbers on the cards you play get shaved.
• It expires by turns, so the debuff's whole cost is concentrated in the window the enemy chose.

Why enemies love it

The AI applies Frail on the turn before a heavy attack. A 20-Block hand reduced to 15 means five more damage through per swing — and against multi-hit enemies, the loss multiplies across every hit. Frail plus Vulnerable on the same turn is the classic combination that ends unprepared runs.

Playing around it

1. Block harder, not smarter: when Frail is up, simply play more block — the percentage punishes relying on one perfect defensive card.
2. Non-card block ignores it — relic and potion defenses are full price; hold them for Frail turns.
3. Kill the clock: Frail only lasts X turns. Turtling one extra turn is often cheaper than forcing damage through a debuffed window.
4. Don't panic-greed: spending the Frail turns on scaling (Powers, orb setup) instead of taking the damage trade converts the debuff into a wash.

Frail rarely kills by itself; it kills by making an already dangerous turn dangerous-er. See it, count the enemy's next intent, and spend accordingly.

Keep reading:

• The Four Core Mechanics, Explained
• Beginner's First Run Guide
• Class Difficulty Ranking