make non-hero unit use tome

ok i need to know if there is way to make a non-hero unit (archer for example) use a tome of (exp. retraining etc)

i tried to give normal ability (inventory hero) but the game would crash on that. anybody know of a way?? thanks in advance.

there is a reason for that, if an archer used say a tome of agaility what would it do?
think about it it needs to be a hero

what im going for is like this...

for every (5) kills a unit is given a tome of (insert type) gives you a reason to keep alive as long as possible.

What angel is trying to say is that normal units (i.e. non-heros) don't have an agility stat. What would you be raising?

okay i see now. so would there be a way of editing an item (say the tome of agility) to give bonus damage (like war drums, but alot less damage and permanent) to the killing unit?

I think the only way of doing this without heroes would be to just replace the old unit with a slightly stronger version that looks the same. Either that or give them upgrades.

or, if you have some time, make all your units heros by basing them off other heros (make a custom hero) and, well, wait, only hermits like me have that much time -_- maybe you can make the "unit heros" be only certain units?