Epidemics
Epidemics are enchantments that transfer from attacker to defender in battles.
Two epidemic enchantments exist: 
Black Death and 
The Wall of Silence.
They are released by the casting of these spells by a powerful-enough mage. The initial duration of the enchantment (in turns) is dependent on the spell level of the caster.
Epidemic infections last for limited number of turns. When transfered, the number is copied from the attacker.
Multiple enchantments by mages do not stack. This also applies to infection by epidemics.
- If infected while already infected, the duration of the first infection remains.
- Black Death and The Wall of Silence infections do not interfere.
Related
The ancient 
spell Cancellation instantly cures a running epidemic.
