DJ

You can buy the DJ for 1500 coins in the shop and it buffs other towers upgrade cost for example the Bench person

Upgrades:

lv1: he boosts the range of all towers in his range of 5 (placement cost 1000)

lv2: he makes upgrade costs cheaper by 5% and boosts all towers range by 10 : his range is now 10 (upgrade cost 700)

lv3: he make upgrade costs cheaper by 10% and boosts range of towers by 10 : his range is 15 (upgrade cost 1200)

lv4: he boosts dmg by 30%, makes upgrade cots cheaper by 50% and boosts range of towers by 50% (upgrade cost is 5000)

lv5: he boosts dmg by 75%, makes upgrade costs cheaper by 100% and boosts range of towers by 100% (upgrade cost is 10000)