Quintessons

Quintessons are a mysterious and ancient race, no one is sure where their home planet is, but it seems the place to encounter them is at Unicron's Head.

Biology
Quintessons are physically weak but they make up for it in sheer brainpower.

Their body is shaped like an upside down egg, with several thin antennae like tendrils bristling from the top, from the bottom of their bodies several segmented tendrils spill out.

These tendrils end in thin 'fingers' and are used both to manipulate objects and for locomotion.

Culture
Mysterious and quiet, Quintessons are notoriously hard to deal with or even find.

Their culture is almost non-existent as far as the Universe knows.

All that is known is that Quintessons are cold and distant from others, even when trading, they forever hold a creepy aura that tends to unsettle everyone nearby.

They seem only interesting in various fields of Science and their ability in this field is rumoured to be so great they can grant immortality.

They are regarded as unethical and are not above petty slaughter and seem to amuse themselves by judging individuals before tossing them to their pets as food regardless of their judgment.

They are known for shady deals involving weaponry and even worse their pets are rumoured to be the tortured and mutilated remains of people they capture, the Quintessons seem to take pleasure in the discomfort this causes and are yet to confirm or deny such rumours.

Ultimately they are shrewd, manipulative, back-stabbing, scheming 'entrepreneurs'.

Technology
Quintessons seem to be no strangers to ANY field of science, as their knowledge seems to span eons, as if before time itself.

They are capable of seemingly anything from creating WMD's to horrific mutagenics.

They take glee in letting others kill each other with their creations and capturing those who cannot pay to become their next 'weapon'.

Trivia

 * tfwiki page on Quintessons.
 * Oddly they seem to resemble brain cells.
 * They seem to have a strange aversion to Seibertronians.