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The orb of light is an item that is found by destroying shadow orbs that are found at the bottom of corrupted chasms.
The orb costs 40 mana to summon and it will follow you for 5 minutes which is the equivelent of having a torch following you. However, the orb of light does tend to lag behind when using hermes boots or falling, but it does teleport to you after a short period of time.
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