I decided to give hardcore one more try, this time I wasn't so stubborn to try my way forward myself but asked youtube for help with some guides/builds. It landed on this interesting video for a Mage Runemaster build by RageGamingVideos.
Instead of boring you with the run-up to mastery, I decided to speed that process up 2.5x, realizing now I could've also not bothered with re-rendering and encoding it and just asked you to speed it up on youtube as there's no commentary on this part, oh well, now you can speed it up even more!
Alright so now that we've picked our mastery we got our first ability from it which is going to start making things go boom! From here on out I started recording mic'd up and explaining it a little in the beginning until I start focusing on not dying. :D I talk a bit here and there but really trying not to let another character die suddenly, especially since I've swayed from the original build recommended in the youtube channel by going more damage and less hp/surviveability. There's a few close encounters in the sped up version and in the next one too. Wonder how long I'll manage to stay alive. :D