Rank 4 Hero Nanocrates

Rank 4 Hero Nanocrates are a type of loot source that gives you a hero with Rank 4 (Fighter Rank) The Rarities of rewards are

Common Rewards

Valeria

Gearbreak

Skullshot

Argon

Uncommon Rewards

Havoc

Kiera (Rank Rewards)

Ovara

Viktor

Rare Rewards

Ovara

Hardbreaker

Mandrake (Rank Rewards)