Siphon Bullets

DefaultEnhanced

Siphon Bullets
Cost		6,400
Tier		4
+15% Weapon Damage
+10% Bullet Resist
Passive			1.2s
Your bullets temporarily steal Max HP from enemies. Enemies regain their stolen health when the debuff expires.
2.5% Max HP Steal 17s Steal Duration
Internal name: upgrade_siphon_bullets

Siphon Bullets
Cost		6,400
Tier		4
Enhanced
+15% Weapon Damage
+20% Bullet Resist
Passive
Your bullets temporarily steal Max HP from enemies. Enemies regain their stolen health when the debuff expires.
4 Max HP Steal 17s Steal Duration
Internal name: upgrade_siphon_bullets

Siphon Bullets is a Tier 4 Vitality Item that can be purchased from the Shop for  6,400.

Notes

Shooting an enemy hero deals 35 damage and applies 1 stack of Siphon* for 17 seconds, refreshing on subsequent applications, and stacking infinitely. Afflicting an enemy with Siphon places the effect on a cooldown of 1.2 seconds. Each stack of Siphon lowers the maximum health of affected heroes by 35.

Each stack of Siphon will always remove 35 max HP from afflicted targets, but the flat damage dealt may interact with certain passives (tested at half HP to visualize damage dealt independently from max HP loss).

• The 35 damage dealt by Siphon Bullets cannot be increased or decreased by Bullet Resist, Spirit Resist, or damage amplification (Pocket's 1 or Escalating Exposure).
• Shiv's Bloodletting passive will reduce the flat damage dealt by Siphon Bullets, but Shiv will still lose 35 max HP per stack.
• The 35 damage dealt by Siphon Bullets will still trigger Abram's regeneration passive
• The damage dealt by Siphon Bullets does not proc item effects.
• Siphon Bullets does not trigger if the initial bullet deals 0 damage.
• Siphon Bullets can not be applied on multiple targets by Ricochet, only the initial target will receive the debuff.

Upon inflicting Siphon on an enemy, the user gains one stack of Siphoning for 17 seconds (reduced by the target's debuff resist) and then heals 35 health. Each stack of Siphoning increases maximum health by 35. When an enemy with Siphon has their stacks refreshed, the Siphoning stacks gained from that enemy also have their duration refreshed. If Siphoning stacks have been gained from multiple enemies, refreshing the duration of Siphon on an enemy will only refresh the duration of Siphoning stacks gained from that target, and the buff indicator will show the duration with the least time left.

• If an enemy with Siphon has their stacks expire, the enemy is healed for the same amount of max HP restored.
• An enemy can use Debuff Remover to remove stacks of Siphon; this does not remove Siphoning stacks from the owner of Siphon Bullets.

When an enemy affected by Siphon dies, the item holder heals 35 health and gains one invisible stack of Siphoner (if they were the one to secure the kill. Assists will not steal a stack). Additionally, the killed enemy gains one invisible and uncleansable stack of Siphoned. Upon death, the two most recently applied Siphoned stacks are removed from their targets and the item holder will lose two stacks of Siphoner.

• Selling Siphon Bullets does not remove Siphoned from affected enemies.
• If a player gets enough Siphoned stacks to have negative health, they become unkillable.

Health gained from Siphoning is visible on the user's healthbar to allies and enemies.

• 
  Ally Siphon Bullets' gained health
• 
  Enemy Siphon Bullets' gained health

*All visible buff/debuff stacks are labelled as "Siphon Bullets" in-game. The health gained from kills is not explicitly displayed to the item holder or the target. Terms have been adjusted for clarity on this page.

Update history

View the full update history: Siphon Bullets/Update history

Update	Changes
March 6, 2026	Now steals 2.5% of enemy max HP per bullet instead of a fixed amount. (Undocumented): No longer permanently steals max HP on enemy kill.
December 16, 2025	Cooldown increased from 0.8s to 1.2s.
September 4, 2025	Max HP Steal reduced from 55 to 35. Max HP Steal now scales per Boon (0.8) Duration reduced from 20s to 17s.

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