Mythics

Someone pls enlighten me how to use resource mythic correctly. Like if i wanted to spam ky OH skill. Or i just wanted to spam my MH to kill. Or use both to spam. I still dun understand how to use the correct resource mythic

Is it resourceful mythic? If so it makes mana and health potions explode( resource orbs). It does not affect your oh and mh weapon damage or for spamming skills.

This is what i understood in the codex.