Blind
Appearance: Chirping sound indicates success, but no outward sign
Success Rate: BaseChance*(97-INT-LUK/3)/100 %
Duration: 30 - BaseLevel/10 - Int/15 seconds (15 seconds minimum)
Recovery Items: Green Potion, Panacea
Recovery Skill: Cure
Resistance Items: Geek Glasses (15%), Glasses (15%), Martin Card (20%), Purple Sunglasses (10%), Sunglasses (5%)
Immunity Items: Blinker, Deviruchi Card
Effect: While Blind, the targets flee and hit are reduced by 25% each. The sight range of a monster becomes 1 tile while Blind, although they can still react to attacks and spell casting normally and looters can still loot. The sight range of a player becomes 10 tiles while Blind. Some objects on the screen will become very dark for the player.
Silence
Appearance:

emotion appears intermittently above head of target
Success Rate: BaseChance*(97-VIT-LUK/3)/100 %
Duration: BaseDuration*(100-VIT)/100 seconds
Recovery Items: Green Potion, Panacea
Recovery Skill: Cure
Resistance Items: Flu Mask (10%), Gangster Mask (15%), Stainer Card (20%)
Immunity Items: Marduk Card
Effect: The Silence effect stops the use of all non-passive skills.
From:
http://rodatazone.simgaming.net/mechanics/status_effects.php