The name of this subject is official, but is derived from internal data, such as file names or unused text. If a better source gives this subject a different name, then this article or section should be renamed accordingly.
Place a tower on each of the four tower category pedestals and upgrade each of them to any tier 5 upgrade.
Place a Primary tower in front of the bottom left grave, a Military in front of the bottom right grave, a Magic tower in front of the middle left grave, and a Support tower in front of the middle right grave.
Upgrade the Super Monkey on the altar to a Sun Temple. It will sacrifice all towers on the tower category altars. After a short pause, the altar collapses, selling the Sun Temple and replacing it with Myrkul for the rest of the game. This prevents other towers from being placed inside the crypt for the rest of the game.
Myrkul's hook attack targets MOAB-Class Bloons with infinite range and fires grappling hooks at them (prioritizing the strongest Bloons first), dragging them into the middle of the map and destroying them in one shot. It fires up to three grappling hooks at a time, with a 1.7-second cooldown between attacks. Each hook can grab one MOAB, BFB, or DDT, or two hooks can grab one ZOMG. It cannot target BADs or Boss Bloons but can target Dreadrock Bloons. Grappled Bloons generate twice as much cash as normal when destroyed.
Myrkul's area of effect deals damage to up to 120 Bloons in a radius of 50 units around the middle of the crypt every 0.1 seconds. It deals 2 base damage and +5 damage to Ceramic Bloons (including Dreadbloon's Ceramic Armor Shell), but its damage does not soak through layers (meaning it only matters for Bloon layers with more than 1 health). It can damage all Bloon types and can hit Camo Bloons. Since Myrkul is not considered a Primary, Military, Magic, or Support tower, it can always damage Dreadbloon.
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This tower is not named in-game and has never been referred to by name in any update notes. Internally, it has multiple different names:
The internal name of the sound the tower makes when it spawns is UIPropEncryptedSpawnMyrkul. "Myrkul" may be derived from myrkur, a Faroese and Icelandic word meaning "darkness" (both derived from an Old Norse word with the same meaning).
The internal name of the monkey model that appears when it spawns is Everseer.
The internal ID of the tower itself is SpookyCreature.