Perfect Rainbow Ore is one of the game's resources.
It can be synthesized from x5 Pure Rainbow Ore with 500 gold. You need to level up a tower of any kind to level 70 before you're able to do this.
Second TypeEditThere is a second type of Perfect Rainbow Ore, introduced in version ???.
It can be synthesized from 5x Perfect Rainbow Ore (first type) at the cost of 500 gold. You need to upgrade any magic skill to level 110 to synthesize it.