In the battles, troops will be wounded or killed.
The buffs converting Dead to Wounded will convert the troops that are killed in the battle to wounded by a ratio after the battle ends. In that way, you will suffer less loss in the battles.

The formula to convert Dead to Wounded is:
Wounded Amount=Dead Amount - [Dead Amount/(1+conversion ratio)]

e.g. Conversion Ratio=100%. Dead Amount=10000. Wounded Amount=10000 - [10000/(1+100%)]=5000