i was hitting around this idea with Seanachaidh, and we came to the conclusion that the ability to sacrifice units for a small gain would be useful for a few reasons:
1. to gain a resource (such as souls or something) which you cant normally obtain
2. to recycle the unit, maybe for a fraction of the cost
3. or even maybe a way to sacrifice a unit by putting it into a building for a production boost or something (this would work off of the garrison idea)
what do you think?