Hero Upgrade: Max Level of Hero is Level 100. Each time you upgrade, your heroes will gain 1% base stats.
2.
Weapon Upgrade: Max Level depends on Weapon's Star.
1-star Weapon: Max Level 50, each upgrade gains 1% base stats.
2-star Weapon: Max Level 70, each upgrade gains 2% base stats.
3-star Weapon: Max Level 90, each upgrade gains 3% base stats.
4-star Weapon: Max Level 110, each upgrade gains 4% base stats.
5-star Weapon: Max Level 130, each upgrade gains 5% base stats.
6-star Weapon: Max Level 150, each upgrade gains 6% base stats.
3. Castle Upgrade: Level 3, Level 5 Castle will unlock 1 Hero slot. At Level 8, Castle will gain a Larva skill: burn enemies HP when they are near the castle.