Silence - Afflicted cannot cast magic. Includes Bard Songs and Magic Sword, but does not include Blue Magic.

Silence [!White] - 75% Hit Rate.

Red Mage | White Mage

World 1, Buyable at Carwen, Karnak, Jachol for 280 Gil

Black Mage | Blue Mage | Freelancer | Mime | Red Mage | Summoner | Time Mage

World 3, Wonder Rod

Silence Sword [!Spellblade] - Always Procs.

Mystic Knight

World 1, Buyable at Carwen, Karnak, Jachol for 280 Gil

Rainbow Wind [Enemy Spell] - Always Hits. Also inflicts Blind and HP Leak.

Beastmaster

World 1, Overworld (Karnak Area) - Aegir
World 2, Great Forest of Mua - Galajelly
World 3, Island Shrine - Oiseaurare
The Rift, Castle - Galajelly

Needle [Enemy Spell] - Always Hits. 50% chance of inflicting Blind or Silence.

Beastmaster

World 1, Overworld (Tycoon Area) - Killer Bee
World 1, Overworld (Ancient Library Area) - Silent Bee

Mage Masher [Weapon] - 33% Proc Rate.

ALL JOBS EXCEPT White Mage and Monk

World 1, Karnak Castle - Sorceror (Common Steal)
World 1, Buyable at Jachol for 900 Gil

Rune Bow [Weapon] - 33% Proc Rate.

Freelancer | Ranger

World 3, Buyable at Mirage, Undersea Trench for 10000 Gil
The Rift, The Void - Gilgamesh (First Void form, Rare Drop)

Mute [!Time] - Always hits. NOTE: Time Magic Mute doesn't work in most boss encounters and silences everyone.

Time Mage

World 1, Buyable at Walse, Karnak for 320 Gil

Beastmaster

World 2, Drakenvale - Drippy