"Deadly foes" refers to enemies or adversaries who are extremely dangerous and pose a significant threat or risk to someone or something.
Sentences with «deadly foes»
The survivors built a city beneath the Traveler, and have begun to explore our old worlds, only to find them filled with deadly foes. (gamepur.com)
To survive against deadly foes roaming the streets — vampire hunters, undead Skal and other monstrosities — you will need to choose which civilians to feed on, so you can grow stronger and evolve your vampiric abilities. (playstationenthusiast.com)
It may be the direct cause of the disease, or just an opportunistic infection hitching on the back of a more deadly foe (see... (newscientist.com)