Season: "Winter 2013-14". Online games for rating (reports, discussions).

In melee combat, it has a 50% chance to poison the enemy. The poison of the Wyvern Monarch reduces the creature's HP stack by 10% of its maximum HP each round (including at the moment of the attack). The maximum HP level cannot fall below 50% of the initial value. The poison can be cured and dispelled, but if it has already taken effect, the maximum HP will remain reduced until the end of the battle.