is the upgrade worth it

how much does the heal thing actually heal (i know its a percent but at what rate does it increase and so on) also what is the conversion rate, just all the statistics need to be viewable imho, obviously i am new to the game becuase i said in another post idk how the battle field looks

After a fight ur army will HEAL a certain percentage based on skill level (I beleieve level 1 skil heals 5%) When some1 attack u and u have traps a certain percentage based on skill level u will take control of. (also 5% a level I think) hidden attack hides ur troops when u attack (I'm not sure percentage)Unlock chest skill I obviose what it does. Sry I don't know the complete answers

Kind of common sence when i say this but the more troops that die the more that are healed