The Wounded debuff is like a combination of Poisoned and Nerve Damage as it does damage over time and the target cannot be healed. The debuff can be removed by a Heal Potion.
Wounded can be caused by serveral heroes, Bovus El Doro' Epic and some Boss enemies in Boss Mode dungeons.
Heroes
The following heroes have or can inflict/apply Wounded:
Dwarven Fury (Special Attack): Melee Physical attack with a chance to Wound. For 2 turns, this Hero's gains Ethereal Spirit shield (HP will not drop below 1) and he will Revenge all attacks done on him.
Iaijutsu Strike (Special Attack): Armor-Piercing Melee Physical attack with a chance to Wound, and purges Taunt on the target enemy (if any). Blade Fury (Special Attack): 3 Melee Physical attacks with a 20% chance for an extra attack. CRITs have a 50% chance to Wound.
Steel Sharpens Steel (Special Attack): Buffs team +ATK and +CRIT, then does a Melee Physical attack on target enemy with a chance to Wound. Switches 'To War!: Artillery' to 'To War!: Infantry'.
Void Assault (Special Attack): Melee Physical Attack on each enemy with a chance to Wound and add Null-Magic to each enemy, preventing the next buff on the enemy. This ability is considered single target.
Claws of Madness (Epic): Chance to do a Melee Physical attack for 2x damage with 100% chance to Wound, reduces the highest health enemy to 50% of their current health.
Pressure Cooker 2.0 (Epic): Chance to attack all enemies for 2x damage with a chance to apply a random burn (Burned, Wildfire, Demonfire, Soulfire) on all enemies and Wound the target. Deals additional damage based on Pressure.
Molten Sword (Epic): Chance to deal 2 Armor-Piercing Melee Physical attacks dealing 2x damage with 100% chance to Wound. If the enemy is killed, this attack is repeated on a random enemy.
Dryad Ice (Trait): Starts dungeons in Ice Block, reducing damage taken (90% Damage Reduction) and Debuff immune until their first turn. Can't be stolen, copied, or purged.
Ambush Tactics (Special Attack): Ranged Physical attack on target enemy and all Ranged allies attack the same target, then gain Stealth and become Invulnerable for 1 turn. Starts Powered.
Ice Block (Trait): Starts dungeons in Ice Block, reducing damage taken (90% Damage Reduction) and Debuff immune until his first turn. Can't be stolen, copied, or purged.
The Last Word (Trait): Slow allies and self take 30% reduced damage from Fast enemies. Slow allies revenge attacks twice. Slow allies can't have buffs removed or debuffs added by fast enemies.