Gol D. Roger had two precious things in his life named Ace - one was his son, and one was his sword. His Supreme Grade cutlass was able to withstand being imbued with both Busoshoku and Haoshoku Haki. Not only that, but it was strong enough to send Kozuki Oden barreling through multiple boulders.
Too bad we only get to see this sword in action during flashbacks.
