Items, Spells, or abilities that prevent a creature from being shapechanged?

So far, I've only found Moonbeam. 
Looking for items or other spells, or even abilitie(s) that can be used to prevent a creature from being forcibly shapechanged. 

Partnered Content accepted as well, except for Obojima. 

There are several enemies with "immutable form" ability which prevents them from being shapechanged.

I am looking to make a player character immutable. 

Quote from aether_tech >>

I am looking to make a player character immutable. 

Custom magic item, or just sufficient bonuses to make your save (fighter indomitable for example).

Quote from aether_tech >>

I am looking to make a player character immutable. 

 Not possible with out Homebrewing. 

I did find my answer, it is sadly in Lost Laboratory of Kwalish, the Leather Golem Armor

Which is not part of the campaign I am in that i need this for.

Quote from aether_tech >>

Which is not part of the campaign I am in that i need this for.

 Generally speaking any single effect that is common enough to be worth seeking out an immunity for is also something the DM isn't going to allow you to have immunity to.