Sentry Keeper #2

Sentry Keeper No. 2 is a guardian and boss of Under Hammer. In pair with Sentry Keeper No. 1, they try to defend Thunder Hammer. Sentry Keeper No. 2 is more of a melee type.

No. 2 is in a red color, while No. 1 in a green color. 2 also carries a saw.


The Sentry Keeper has three attacks. It can swing its large saw at a 360 degree angle, and can shoot bluish orbs which turns into an explosion. The most dangerous attack it possesses when it spews out powerful flames in all directions.

Warning: If you kill Sentry 1, Sentry 2 will become enraged, enhancing its attack and defense power and vise versa.


  • This is the only boss that is paired with another boss, similar to how both Dark Storm and Furious Storm are paired as mini-bosses. Except for when you kill either Dark Storm or Furious Storm one is brought back to full health.
  • Currently this is the only monster that wields a saw.
  • It is similar in abilities to the PTX-40A from Lost Planet.
  • This monster is a robot made out of barrels.

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