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Silva Stun was a debuff that made the target completely unable to move for its duration. Almost all enemies were susceptible to this debuff, as well as some bosses. At the time of removal, there were no natural ways to inflict or be inflicted with the debuff.
Trivia
Prior to Update 1.5.0.001, it was inflicted by melee projectiles while wearing Silva armor or Auric Tesla armor with the melee helmet, but became unused once the Silva Helm became a vanity piece.