What is the dome/bubble around certain enemies in Diablo III?

What is the dome/bubble around certain enemies in Diablo III? - Colourful cookies and Flowers Left Around Vintage Sowing Machine

Some enemies in Diablo III have a nearly-transparent, blueish dome/bubble around them; it's much larger than the Shielding bubble (with a radius maybe two or three times the height of your character), and it can pass through walls. The Keywardens have it, and I've also occasionally seen it on elite mobs. What does this dome do?

Here's an image from Diablo Wiki of a Keywarden with its bubble:

Sokahr the Keywarden with its bubble






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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

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