From patch note :
Hero Level Progression Rewards
Hero progression rewards have also received significant changes, and can be earned at the following milestones:
- Hero level 5: Hero Portrait
- Hero level 15: Master Hero Portrait
- Every 5 Hero levels: 500 Gold
- Every 10 Hero levels: Hero-specific Loot Chest
Hero-specific Loot Chests are guaranteed to drop at least one item that’s usable by the Hero who earned it.
What if I reroll one of those chest ? Will the Hero-specific reward be rerolled too ?
Outcome will be :
A/ Another hero specific reward ?
B/ Anything else ?