How about masteries on defensive buildings.
Just like we have in Hay Day(people who played may know)
If the defensive building killed ___ troops, it will get __ mastery stars.
100 troops - 1 mastery star - 10% more damage
500 troops - 2 mastery star - 1 tile extra range
1000 troops - 3 mastery star - 15% more fire rate
5000 troops - 4 mastery star - 3 tile extra range
10000 troops - 5 mastery star - 30% more fire rate
Similar for troops
If the troop deals ___ hit points damage, it will get __ mastery stars.
1000 hit points - 1 mastery star - 10% more damage
5000 hit points - 2 mastery star - Regeneration capacity 2 hit points per second
10000 hit points - 3 mastery star - 15% more attack rate
50000 hit points - 4 mastery star - Regeneration capacity 5 hit points per second
100000 hit points - 5 mastery star - 30% more fire rate
