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.