Silencer
passive Documented When to buy Silencer Silencer +12% Spirit Resist -25% Spirit Damage Reduction +2.5s Silence Duration +6s Debuff Duration +10s Immunity Duration
Buy when an enemy spellcaster is the main damage threat and you can land sustained bullets on them.
When to skip Silencer
Does not apply to enemies who are currently 
Unstoppable Unstoppable +60s Cooldown +5.5s Duration +125 Bonus Health +25% Debuff Resist Builds from Debuff Reducer ; the 10s immunity means you cannot chain-Silence one target.
Gotchas
The mechanics people most often get wrong about this item.
- Silence does not apply to a target with Unstoppable active
- 10s immunity window per target after a Silence expires
- Build-up per bullet varies widely by hero (roughly 1.9%-45.5%)
Problems it answers
- Sustained spirit damage — “Their abilities chip me down constantly.”
- Burst damage — “I die before I can react.”
- Channelled ultimates — “Their ultimate wins the fight on its own.”
- Backline assassination — “Their carry deletes my squishies.”
Heroes that make this worth a slot
Heroes whose kit creates the problems Silencer answers. This is derived from kit properties, not from measured build results.