I’m aware that there are certain questions you can answer and certain ones you can’t. I’d ask this on your stream thread, but it seems you feel questions about the game are off topic there. So I’ll dedicate an entire thread to it instead. Though you can’t disclose the exact drop rate of Heart of Rage. Perhaps you can help narrow it down a bit more by answering the following question please:
In the context of Vault Battle rewards…
Does a player have a better chance of receiving a Power Orb or a Heart of Rage?