Embryo+

Dark Embryo is a harder version of Embryo that only appears in Red Layer 32 of Infinity Drive, and occasionally Daily Drive.

He has more health than Embryo and his phases are much more brutal. He is also darker in color, hence the name.

Phase 1: slow chase
The easiest phase. Embryo will chase you slowly and fire forwards from his weapon.

Simply walk backwards away from him and fire away. As long as you stay far away enough to not be melee'd, and close enough to not be hit by the bullets, you will be fine.

He drops a Powerup after this phase.

Phase 2: easy static radial bullet hell
Embryo will move to the centre of the map and produce a bullet hell pattern.

The spacing is tight, but not too difficult to avoid. Try to maintain medium distance to have enough time to react.

Phase 3: heavy rocket salvos
Embryo will move away from the centre and call in lots of aerial Rockets.

This phase is effortless if you simply slowly circle him, the Rockets can't track you in a circle.

He drops a Powerup after this phase.

Phase 4: fast chase
Faster version of Phase 1. Embryo will chase you quickly and aggressively. He will also backpedal, at which point you should chase him.

It's possible to keep up without Accelerate, though it can help.

Make sure to only make use of static weapons like Propeller Mines or Plasma Shield while he is on the offensive, or they will barely hit him.

This phase is easy for Aubergine since you can freeze him in place with a Singularity if he outpaces you.

Phase 5: difficult static radial bullet hell
More difficult version of Phase 2 and the most difficult phase. The first few patterns can be avoided fairly easily, but he starts to produce extremely fast and tight rings with gaps in them, forcing you to back up to a distance in order to anticipate the gaps and move through them. Therefore, get in your close-ranged damage as soon as you can, then back up to anticipate

He drops a Powerup after this phase.

Phase 6: dynamic bullet hell + heavy rocket salvos
A fairly difficult phase. In addition to the Rocket salvos from Phase 3, he also produces a rotating circular bullet pattern like regular Embryo's Phase 6, and slowly backpedals.

The best way to deal with this is to stick close to him and move clockwise in sync with the pattern in order to not be hit. The rotation is just quick enough to get out of the way of the rockets.

This phase is very difficult with Aubergine, since hitting him with Singularity stops him in place and defeats the aforementioned strategy. Without Singularity you likely won't deal the necessary DPS to hold chain. You will have to be much quicker on your feet to simultaneously avoid the rockets and his bullet pattern if you want to make any use of Singularity - Accelerate is practically a necessity.

Multiplayer strategy
Dark Embryo is significantly more difficult in multiplayer, since he can rapidly shift focus between players. This can cause him to spray practically un-dodgeable projectiles across the map, and make some of his patterns harder to read.

If possible, one player should stick very closely to him to maintain focus, while the other(s) bombard him from a distance and only move in for a Shutdown. The focus player should be the weakest character at long range, ie. Coral, Starch, Lemon etc.

Trivia
He was made as part of a now-abandoned hard mode for the Campaign. http://ask.fm/IronicAccount/answers/139453602547