Mana Sub Zero Initial Release!

Note: 1.20.1 will be released at some point, don't expect any ETAs.

Changelog

Content:

- 2 new mage armor variants:
   - Terrible Warlock
   - Abyssal Warlock
- Added Pyrium Chakram
   - Inflicts Soul Fire and Soul Burn
   - Don't worry, you won't need a ton of pyrium, just one. It has a duplicate recipe.
- Added Abyssal Spellbook
   - Haven't planned out its abilities at all yet. Would be nice to get ideas however.