Units that cannot be healed
 

I read Edi's FAQ before posting., and that only mentions undead units and afflictions caused by old age that cannot be healed by normal healing units.

In a test game I have a Mother of Serpents and after numerous turns she cannot heal a Golem.

So in addition to undead units not being able to be healed
by normal healing units, we can add lifeless to the list?

While I have not tested this, I assume demons and magical beings both can be healed by a Mother of Serpents. I am fairly certain I healed an AQ with a fairy queen in Alpaca, but I am not 100 percent sure.

Re: Units that cannot be healed
 

Since no one responded, I did my own tests:

Cannot be healed by healers:
1. undead
2. Golem

can be healed by healers:

1. Demons
2. Magic Beings