Mobile Key Molds

[Voidrive]

I can't seem to get the Hallowed and Jungle Key Molds no matter how long I farm for (so far killed 14k Pixies) and I've tested and gotten doubles and triples of other molds for the other biomes within 2k kills :/

 

[Unit One]

I can't seem to get the Hallowed and Jungle Key Molds no matter how long I farm for (so far killed 14k Pixies) and I've tested and gotten doubles and triples of other molds for the other biomes within 2k kills :/

It is likely a case of very bad luck. Key molds can drop from any enemy in the respective biome, so make sure you're killing pixies while you are actually in the Hallow. If they are spawning in the Hallow and you are killing them not in the Hallow it doesn't count.