Stagnox

Stagnox is the first boss in Spirit Tracks. He appears as a giant green and brown stagbeetle with a purple abdomen.

In the PAL version of Spirit Tracks, Stagnox's title is Armoured Beetle, instead of Armoured Colossus.

Strategy
At the start of the fight, Stagnox will be on the ground and will try to ram Link with its horn. He must run to its backside and use the Whirlwind to remove the gas which will allow him to attack its vulnerable backside. Eventually it will take flight and release blue larvae creatures that revert to bombs when attacked. Link must blow one of these at Stagnox when it charges at him to flip the boss over, to once again leave itself vulnerable to attack.