What does what

Unit type Cost Per Unit Amount
Priests 5,000 Kuwal
Engineers 7,500 Kuwal
Labourers 10,000 Kuwal

?

Just wondering what priests and engineers do

They both gives money.

Untrained Soldiers (20 income per turn)
Priests (50 income per turn)
Engineers (60 income per turn)
Labourers (75 income per turn)

ah ok thanks, and ive just got 4 mil uu out of nowhere

gave you and a couple of others the 4 mil uu's like everyone else.

and concerning different workers...
https://aderanwars.forumotion.com/upcoming-updates-f23/various-worker-updates-t13.htm
well that's one of the things that's not yet done. But it's gonna be a funny thing later

dam im training priests then

for now stick with labourers, i have exams, expect little change/updates to game in the next month.

any major updates will be declared ahead and will most likely be coupled with a ppt for a day