A redoubtable person is
Redoubtable: (humorous) (of a person) formidable, especially as an opponent.
When a piece of land is a quagmire it is
Quagmire: A soft boggy area of land that gives way underfoot.
You would perpetrate
Perpetrate: Carry out or commit (a harmful, illegal, or immoral action)
When someone riles you, he
Rile: (informal) Make (someone) annoyed or irritated.
Burnished armor is
Burnish: usually as adjective burnished - Polish (something, especially metal) by rubbing.
Time to share