[Mod Request] Heavy armour for mages

[helpmewithnaming]

There is no heavy armour designed to be used by the mage classes.

I want to play a cleric (tempest) 2, sorcerer (storm) 10. The cleric gets me heavy armour proficiency. 

I would like a heavy armour that is designed for a mage to use. Would be nice if it tied into lightning and/or thunder magic.

Some ideas from other armours that could jsut be ported over:

Exquisite Focus: While concentrating, you add your Spellcasting Ability Modifier to your Saving Throws and gain a +1 bonus to Armour Class.

Well-Liked and Well-Fortified: At the beginning of the wearer's turn, the robe activates, granting them temporary hit points equal to their Charisma Modifier.

Poison Trails: When the wearer casts a spell that deals Poison damage, it deals an additional 1d4 Poison Damage. - make lightning/thunder

or could do something with lightning charges.

I don't want it to be something super broken, just something that feels like it ties in nicely with the build and the game as a whole. Thank you for any help with this.