How do you unlearn tech?

I can raise tech using trigger "set tech level", but it says i cannot unlearn the tech.

im making a map where the tech level of X ability is directly linked to the amount of Y units. so if a number of Y units die, the tech level of X should lower.

is it possible via triggers or via anything else to LOWER the tech level?

No

is there a way to permanently higer/lower max health of a unit then?

Search for 'bonus mod'. I think theres a version of it in the caster system.

No invx or use Blade's SetUnitMax Sys

-Av3n

Note: I just made it a health bonus for an example to show you.

I'm not sure if this will work but could you create multiple versions of a health bonus ability (Like the Health Stone or something) and give some versions a negative number.

Set the abilities to an array, -2 does -20 health, -1 does -10 health, 1 does +10 health and so on. Then there are two ways from there.

One is to make a unit group and add every one who is trained/created to that that group. When needed apply the bonus or negative.

Or just make it so when a unit is trained/created add the bonus then. This will cause some people to have more or less health than the others (I'd pick this way, makes more sense than units just gaining health mid-battle).