From Guild Wars 2 Wiki
- Effect type
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Hamstrung is an effect applied to players by the Mistlock Instability Hamstrung. One stack is applied for each percent of the player's health that is missing (multiplicatively, reaching a maximum of 70 stacks at critical health); taking damage or recovering health will adjust the stacks accordingly.“
Slows the movement speed of the target 1% per stack.
— In-game description