Blood Boil
Enemies in your Presence accumulate blood boils periodically. When they die, the boils pop applying Corrupted Blood to enemies near them.
Very solid choice with strong damage or utility for most builds.
Gem Effects
Corrupted Blood deals 2% of slain Enemy's maximum Life as Physical damage per second
Blood Boil applies to non-Unique enemies
in your Presence every (2-1.52) seconds
20% more Corrupted Blood infliction Area of Effect
per Blood Boil on slain Enemy
Inflicts a stack of Corrupted Blood on targets within 1.5 metres per Blood Boil on slain Enemy
Corrupted Blood duration is 5 seconds
Requirements
Best Support Gems for Blood Boil
Ranked by synergy — the game won't tell you which combo deals the most damage
How to Use Blood Boil Effectively
Practical tips you won't find on the tooltip
AoE Clearing
Invest in Area of Effect to cover more ground. Excellent for map clearing and handling packs efficiently.
Duration Matters
Duration scaling extends effect uptime. Less recasting = more time dealing damage. Invest in skill duration passives.
Alternatives to Blood Boil
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How to Get Blood Boil
Use an Uncut Skill Gem to obtain Blood Boil. These drop from enemies or can be purchased from the gem vendor once unlocked through the campaign.