2. "Lucky" Critical Strike Rolls
The concept of a “lucky” roll means that the game rolls twice and picks the better result.

Diamond Flask is a vital item for Path of exile currency crit builds because it makes all your critical strike rolls lucky during its effect. This dramatically increases your effective critical strike chance, especially when your crit is in the 20–50% range.

The Assassin ascendancy also offers sources of lucky critical strikes, amplifying your consistency.

Interaction Tip: Using a Diamond Flask with mid-range crit chance is much more effective than just stacking more flat crit chance passives.

3. Elemental Ailments and Crits
Critical strikes interact directly with ailment mechanics, especially for elemental builds:

Shock: Increases damage taken by the enemy. Shock effect scales with the hit’s damage—crits are more likely to inflict strong shocks.

Freeze: More easily inflicted by crits with cold damage. The higher the crit damage, the longer the freeze duration.

Ignite: Typically caused by Fire crits, ignites from critical hits deal more burning damage due to the increased base hit.

Interaction Tip: Crit-based elemental builds often combine Elemental Focus, Heralds, and Elemental Overload (or instead use Elemental Equilibrium for added resistance penetration) to POE currency for sale take advantage of powerful ailments triggered by crits.