M'Khiin Grubdoubler (quest)

You'll unlock the following extra interactions if keep M'Khiin in company:
 * 1) To the west of Black Pits announcer In Coast Way Crossing in Chapter 8, M’Khiin will notice some goblin remains and try to perform sending on them, it doesn't go well, after the fight, their caches will appear northwest of the bridge for you to loot, be ware of the traps around.
 * 2) After completing Wynan Hess's quest at Bridgefort in Chapter 9, talk to Jegg Hillcarver to craft a new Jegg's Leathers for M’Khiin.
 * 3) North of your starting zone on Underground River surface area in Chapter 10, you'll meet a raid band led by Battuks, you can squeeze more XP out of this encounter if you have M’Khiin interact with them in group.
 * 4) A pile of equipment will appear where you fight the undead hordes at Kanaglym if you travel with M’Khiin there in Chapter 10. M’Khiin will be able to equip two of four items depending on which path she chooses: the shamanic path for The Soulherder's Staff and The Ghostdreamers' Robe; the warrior path for Axe of Kruntur and Kruntur's Armor. Note the choice just determines which two items M’Khiin can use, it won't affect her actual status.