The Hallowor is a hardmode NPC that acts much like the Corruptor, except that it will fire Hallow Spit at the player if it has a line of sight. This Hallow Spit will turn tiles into the Hallow on contact.
When a Hallowor and Corruptor collide, there will be the message, "Dark and light have been obliterated..." and in the two NPCs' place will spawn a small diamond of Oblivion Ore.
Mining the ore will result in getting the achievement 'Like a baws'.
The Hallowor can drop:
- 10% - 1 Crystal Shard
- 4% - 1 Light Shard
- 50% - 1-4 Pixie Dust
- ~10 Silver Coin