
Just like Wolfwing, Tibi will steal HP from as many targeted players as he wants every time enough HP is taken off him. Ladies and gentlemen, meet Tibicenas, the eighth Lord of Chaos.
He'll do this about five times per fight, and once his HP hits below 10,000 or a little lower, a message will pop up saying "Wolfwing goes berserk! End this before he ends you!" and therefore he'll start attacking TWICE AS FAST! He can heal himself at least two more times when he's berserk, too. Whenever you fight him, every time you've taken enough HP off of him, he will use an attack that hits one player for huge damage and, worse yet, heals him.
Wolfwing, an earlier Chaos Lord, can be a pain as well. Of course, once you're in the safe zones, the blast will end up healing you. Every one in a while, it will automatically warp to the center of the battlefield and give off a colorful glow and a message will pop up, warning, "Ledgermayne charges a powerful attack! Enter the glowing safe zone!" This message urges you to quickly run to the glowing safe zones that open up every time it does this, and if you're not there in time, then the resulting blast from the attack will hit you with MASSIVE DAMAGE and, if you have under 1,200-1,600 HP, it can easily KILL YOU. Its toughness is explained by the special boss mechanic worked into it that requires you to pay attention during the fight. Not only is Chaos Lord Ledgermayne in AdventureQuest Worlds bent on starving off all of Lore by sealing off ALL magic from it, it is also so incredibly tough to beat that it'll probably give you nightmares every time you fight it, especially if you're at a low level. Even if the player manages to break its shield and force it into turn-based mode, it's still quite strong due to its ability to switch between physical and magical immunity, along with powerful AOE and knockback skills. Adding to that, the method for breaking its shield is much more specific than other Ganger bosses, since it won't normally take damage from Foxtrot. While other Ganger bosses are hard in their own ways, this one severely punishes the player for failing to dodge in comparison. Absented Age: Squarebound: The Ruin Warden features an arena surrounded by water, which means that its knockback electric beam can easily decimate the player's HP bar if they're hit dead on.
If you're looking for Mario RPG examples, they're listed here. Note: Please don't add anything that amounts to telling the player what they should do to win, as it could result in natter.