Unicorns aren't spawning?

[The One Who Rots]

I have been farming nothing but pixies for 20 minutes now, and not a single unicorn has shown up. Is there any specific requirements I am missing to get them to spawn?

[Nox]

i think that it has to be above ground hallow, make a giant hallow grass walkway 3 thick and like, 100 long and make it all hollow grass, try that

[The One Who Rots]

Originally posted by Nox:

i think that it has to be above ground hallow, make a giant hallow grass walkway 3 thick and like, 100 long and make it all hollow grass, try that

I've found a couple, and they do spawn more frequently now, it seems. Thanks!

[[R] Nerva]

Unicorns only appear in Surface Hallow biomes and can only spawn on Hallowed Grass blocks. If you're too far underground, too far above ground, or in a Hallow Desert, you won't see unicorns.

Make sure no NPCs are nearby. NPCs reduce the amount of mob spawns in their vicinity.
3+ NPCs will totally prevent hostile mobs, like unicorns, from spawning.