Adds the Frost Invoker, a mage subclass.

The Frost Invoker is a Cold-focused caster and unarmed fighter. Their primary stats are Magic and Dexterity.
Frost Invokers know Combat Training and Survival(locked) and have 11 new spell trees, 3 generic and 8 class (of which 3 start locked).

Generic:

Frozen Core: Unarmed training with 40/80 Mag/Dex dam mods, and utility.
Rime Guard: Defense, with a damage shield and one-shot protection.
Ice Floes: Mobility and utility focused on an icy ground effect.

Class:

Hail: Offensive spells which can reduce the cd of Artic talents.
Arctic: Unarmed attacks with AoE, a pin, a multi-hit, and a gap closer.
Winter: Utility and defense, with a decoy and a scout.
Frost: Defense and utility focused on building and consuming a stacking effect.
Chill: Debuffs which proc on cold damage, with active conditional sustain stripping.

Locked:

Blizzard: Defense and debuffs focused on a single AoE spell.
Icicles: Adds a cold-damage psuedo-weapon that procs on unarmed attacks. (high level)
Cryomania: Maical and physical synergy, and cold resist / ice-block penetration sustain. (high level)

Talent icons from https://game-icons.net
Class icon from https://opengameart.org/content/painterly-spell-icons-part-2
Icicles moddable tile attachment from Verdant Pack by HousePet (re-colored); attachment art by Rexocorum.