I couldn't miss the chance to practice my drawing!
Silena is a level 19 White Magic spell available only to White Mages. It removes Silence from one targeted player or ally.
Vox allows a non-silenced user to remove the Silence status effect from a party member. The animation of the spell is a reverse to the Silence spell. In both the original and the Zodiac versions, the License for Vox is White Magick 2, which takes 20 LP to unlock.
The spell initially takes 8 MP to cast and can be purchased for 300 gil from shops Dreadnought Leviathan onwards in the original version, but in the Zodiac versions, Vox is available since the game's beginning and can be used by the White Mage and the Red Battlemage. It is also a Diamond Armlet treasure on Stage 21 of Trial Mode.
Silena appeared as an ability in the original version. At the initial release, Silena was a spell learned by Conjurers at rank 28. The ability cost 2 actions points to set and cost 24 MP to use. When used, the ability would remove the silence status from party members within an area of effect.
After the release of patch 1.20, Silena was removed and replaced with the Esuna spell.
Vox is a White Magic ability with a Rarity of ☆. It removes Silence from one target, it can initially be used four times and it can be honed to Rank 5. It can be created by using Minor White Orb x3, Minor Ice Orb x3 and 1000 gil.
Vox means "voice" in Latin.