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Experiments are very unique mobs, as they only spawn in structures. They vary a lot in appearance and abilities, and aren't related to the hivemind at all, nor are controlled by it. Lore-wise, they're creations of Genesis Labs, and have survived long enough to still be around. Power-wise, they're between Evolved and Hyper Evolved mobs. They are basically the result of fusing characteristics of other mobs. There are a total of four mobs in this tier.
Experiment Mobs
Spawning
Spawn naturally in laboratory structures (Military Camp, Hospital, Permafrost Mining Outpost, and Groundzero structures.)
Spawned from Arena Tendrils as a special mob during a raid.
Unique Mechanics
Stasis
When an Experiment spawns naturally, they will be in 'stasis.' When in stasis, they are frozen where they spawn, and a mycelium vein entity envelopes the mob. They will exit stasis when they spot a target or are damaged.
Shared Aspects & Capabilities
Experiments will attack mobs with Infected forms, golems, and most hostile mobs.
Experiment mobs inflict Mycelium Infection for 30 seconds when dealing melee damage.
All mobs have a 5% chance to drop a Scent upon death.
Can perform low leaps/dashes to chase prey quickly through water.
Experiments don't follow any mobs, nor do any mobs follow them.
Able to use kill points to give themselves buffs, such as strength or speed if the target is running away. They can also give themselves regeneration if they are low on health.
Capable of breaking blocks with a hardness of one or below.
Present a weakness to the cold, like all spore mobs.
Trivia
Experiments don't have special drops upon death. This is because they could be easily farmed due to their spawning conditions.
The lore reason for the stasis mechanic is that Experiments are so old, they couldn't normally be walking around in the laboratories without crumbling into dust. So they went into a stasis to be preserved.
Gallery
A Lacerator in stasis.
A picture posted in the Discord server teasing a Lacerator in stasis before the mechanic was released.