Name: Bloodstained altar
Cost: 3000
Attack: 1-1
Range: 1
Cooldown: 1
Element: Darkness
Gender: None
Ability 1:
FOR THE DARK GODS! (active) - Sacrifice one random Acolyte of greed to the great old ones.
Ability 2:
Eldritch gift (passive) the next wave will be converted to eldritch cultists.
Maybe the second ability could be switched to a Buff or something, if the cultist mechanic is too difficult to implement. Something like raising the HP or the luck of all towers by 5 %