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Xyzzy is the king of the Saurians, and the boss of the elite stage Darklight Depths in Kingdom Rush: Frontiers.


The Saurian King is a colossal lizard that hammers fear home on his enemies.

Xyzzy is a giant Saurian Myrmidon, with fast speed and medium armor. He is the fastest boss in the series, as well as being tied second most armored, being beaten only by Lord Blackburn and rivaled by Hi-Hi Enha.

Xyzzy also possesses a special area attack where he smashes the ground 8 times with his cybernetic hammers. The attack has a cool-down of 10 seconds, and the damage increases with each hit—the first hit deals only 5-10 damage but the seventh and eighth hits can deal over 100. Its AoE reaches over a third of the map and the closer to him, the more damage soldiers receive. This attack is able to harm Ashbite and Bonehart, even though both of them are flying, possibly due to the energy packs inside his hammers. When forced into melee, Xyzzy can catch soldiers with his tongue, swallowing them whole, effectively instantly killing them. Heroes are immune to this, but they will still take the damage. Although they are unlikely to survive Xyzzy's special area attack.


  • Archmage Towers shine against Xyzzy, as he has both armor and high health. Since Xyzzy attacks from the northwest, it is useful to place Archmage Towers on Strategic Points which aren't needed for other towers on that path.
    • With just four of them, three of which should be on the three points above the path, a reasonable number of critical mass upgrades, and on top of any other towers used throughout the other waves, Xyzzy shouldn't even make it past the point where the two entry paths converge.
  • The Battle-Mecha T200's Waste Disposal can slow him down tremendously, and the Wasp Missiles will follow him even as he dashes out of range.
  • Heroes and soldiers are doomed against him, they are best used to delay his minions or to stall him as a last resort.


The Saurian technology story:

The Saurians’ rumors had been right: a god-like creature was roaming their lands!

Saurian King Xyzzy looked at the being that was standing in front of him. He could tell it was badly wounded as blood dripped from its side and its movements were obviously painful. It was clear it needed help and that was the reason it had approached their village.

Anyone would have thought the creature was easy prey, but Xyzzy had heard that even in its weakened state, it could obliterate any enemy with a blast of light in seconds.

As the blast surged from a shiny device the creature was holding on its hand, Xyzzy knew this was not magic. The Saurian had never seen any weapon of its kind before. However, he immediately thought that if his people possessed such power, they would become a force to be reckoned with.

Xyzzy slowly approached the being and signaled one of the tents where bandages and medicinal herbs were offered to it.

With this gesture, a bond was created, one that would change the Saurian’s way of life forever. The being decided to stay, and as a show of gratitude taught the Saurians how to create and operate its homeland technology.


  • Xyzzy is also the fastest boss in any Kingdom Rush game.
  • If on a device that supports screen shake, his area attack shakes the screen.
  • His name is possibly inspired by the "magic word" of a video game cheat code of the same name. In addition, Xyzzy is the mnemonic used when calculating the cross product.
  • Xyzzy is the only boss to appear in the final wave of a stage in Kingdom Rush Frontiers. All the other bosses appear after the final wave.
  • If killed fast enough, before any other enemy starts spawning in his boss wave, Xyzzy's army of Saurians will not die alongside him and must be fought normally to end the level. The music accompanying Xyzzy's boss fight will also abruptly end after his death, leaving the rest of the battle in total silence.

Related Achievements[]

Lizardking.pngI'M THE LIZARD KING Defeat Xyzzy, the Saurian King.



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