active

Cast on Block

While active, gains Energy when you Block and triggers socketed Spells on reaching maximum Energy.

BuffPersistentTriggerMeta
Tier
A

Very solid choice with strong damage or utility for most builds.

Cost
mana
Cast Time
0s
Crit Chance
Max Level
20
Cooldown
None

Gem Effects

Gains 25 Energy when you Block

(0-57)% increased Energy gained

Triggers all Socketed Spells and loses all Energy on reaching maximum Energy

Has 10 maximum Energy per 0.1 seconds of base cast time of Socketed Spells

Requirements

At Level 20:86 Strength86 Intelligence

Best Support Gems for Cast on Block

Ranked by synergy — the game won't tell you which combo deals the most damage

How to Use Cast on Block Effectively

Practical tips you won't find on the tooltip

⚙️

Trigger Conditions

Activates automatically when conditions are met. Focus on reliably meeting the trigger requirement.

📋

Attribute Planning

Requires 86 Int at max level. Plan your passive tree and gear to meet this — don't get stuck unable to level your main skill.

Alternatives to Cast on Block

Similar skills — which one fits your build better?

How to Get Cast on Block

Source
Uncut Skill Gem
Vendor
Gem vendor after quest
Max Level
20
Resource
mana

Use an Uncut Skill Gem to obtain Cast on Block. These drop from enemies or can be purchased from the gem vendor once unlocked through the campaign.