Who said "The finest victories are those achieved without mercy."?

This quote is attributed to Drogon.

The finest victories are those achieved without mercy. - Drogon

"The finest victories are those achieved without mercy."

Drogon War

"I am fire. I am death."

"Dracarys."

"A dragon is not a slave."

"I will burn them all."

"Some battles are worth fighting."

"Sometimes you have to become the monster to stop the monsters."

"Skynet sent me back through time to kill you."

"War teaches us the value of peace."