Idea for a new boss robot

This would be a new boss that would only spawn for certain missions, like having to defend a resistance home base and stuff like that. It would be called the walker or the strider

Why does it remind me of an AT-AT?

And your idea does remind me of a mode at a Star Wars Battlefront where you had to stop an AT-AT before it reaches the resistance base.

Yeah it would be kind of like an AT AT, but it would be more of a mobile artillery cannon.