Description
Both companions have reworked stats, skills, abilities and talents. Everything is balanced as if they went through character creation, except for some minor stat tweaking to make them stand off on their own. 
They start out at level 1, so they level up to the player's level once you let them join. 
Matching equipment for these changes. 

Changed Madora to a sword-and-shield fighter so she now acts as a tank. (And a loot hauler, gave her the Packmule trait as an extra!) 

Jahan has Aerothurge, Pyrokinetics and improved Willpower. 

He now has better synchronisation with a player-created wizard with spells of the opposite schools; Hydrosophy and Geomancy. 
If you do not create a wizard of your own, he just has a different build. 

Install guide
Move this file to *:\Users\[username]\Documents\Larian Studios\Divinity Original Sin\Mods 

Mods most likely do not work together and require a new game to be started. These are unresolvable issues at the moment. So stick to one mod or combine files manually. (That could be a lot of work!) 

Elaboration
When paired with a second wizard, the changes to Jahan allow you to chain-link spells within the same turn, for extra damage. As opposed to vanilla Jahan, who had two schools that complimented each other, which would take two turns to chain. By combining two wizards, they can chain in the same turn. 
Mind you, this chainlinking will only work if you create a spellcaster with opposite schools. 

For instance: 
Turn 1: Player casts Midnight Oil -> Jahan casts Firebolt 
Turn 2: Player casts Rain -> Jahan casts Blitzbolt 
vs. 
Turn 1: Player casts Midnight Oil 
Turn 1: Jahan casts Rain 
Turn 2: Player casts Firebolt 
Turn 2: Jahan casts Blitzbolt 

The former instantly gets you the damage in the same turn whereas the latter will make you vulnerable to being unable to complete the chain in the second turn. 

Changelog
v3: Added missing files 
v2: Fixed Jahan's stats (had one point too much) and added some spells 
v1: Release