can any mas twi opener tell me about heroic pet probability?

[Azemeazed]

Then somehow, i wonder what is the chance getting samael from locked grand crate of the watch xD

I cant tell for massives couse never opened one, but i can tell you about watch crates couse i spent cca 12k plat to open them like 3 years ago and guess what, found 1 mythic warrior chest.