Phyrexia, the nine sphered world of metallic wonder and horror. Original home to Lord Yawgmoth and his legions of loyal servents. Inhabited by an astounding amount of metallic, flesh like cyborgs called Phyrexians, Phyrexia is a centerpiece of the universe having such great power and influence that many other worlds heed its every word without question. The Phyrexian Empire spans over three hundred worlds but it all collides here.
Sphere One - No one has any access to sphere one or any idea what's on it. Yawgmoth has told Crow that is a sphere of nature. Where nothing artificial lives. Meaning no phyrexians no buildings no nothing. Just an outer lare of mother nature in all her glory. While it's never been really seen by anyone but Yawgmoth, he strongly suggests this is what lies here. Only time will tell the truth of what lies on the outermost, and largest sphere of Phyrexia.
Sphere Two - Home to the religious temples of Phyrexia and a vast wasteland. Here the temples praise and worship Yawgmoth and give advice to those who seek it based on the philosophy of Phyrexsis.
Sphere Three - The great military base where new Phyrexians are sent to be trained. While not a real "base" it's more of a training camp where high ranking officials train newer breeds and the newly born to Phyrexsis
Sphere Four - A giant mountain range with vast valleys, called the "Giants Sphere" because the only Phyrexians to actually live here are the two largest brands, the colossus and the dreadnought.
Sphere Five - The actual military encampment where soldiers leave from to invade other worlds via ships, portals and what not.
Sphere Six - It used to be something but it is now only a charred volcanic sphere. A massive impact crater covers most of it, a scar on the otherwise perfect planet. This is where Yawgmoth landed after being hit by the Legacy Weapon and lay unmoving for two millenia. Yawgmoth's memory of what used to be here is very vague and it doesn't much matter now.
Sphere Seven - A giant ocean of oil. Nothing but rolling seas of oil. No solid land exists on Sphere Seven. Pipes run under the vast ocean to churn in new oil when it's produced. This supply keeps phyrexia's metallic wonders going.
Sphere Eight - No one except Yawgmoth a few choice Phyrexians knows whats on this sphere.
Sphere Nine - The great furnace that powers the world rests here in the heart of Phyrexia. Alongside the furnace rests the Great Palace where Yawgmoth lived before taking up residence in Hell. Most people who are visitors to Phyrexia come here, via riftstone gates near the palace. While the ninth sphere is the innermost and smallest it is also the most important as the palace is residence to Yawgmoth and the Eight other head Phyrexians including Gix the preator.
Bewhere. Phyrexians attack and kill on sight. They are 'magic proof' meaning their metallic hides are super resistent to most forms of magic but it can be breached. They are violent and incredibly strong. Intruders are dealt with but anyone with Yawgmoth, or anyone bearing his symbol is held sacred and will be protected from the wrath of the phyrexians.
Main Phyrexian Troops

Shock Troops - The main phyrexian attack force. Mostly made of men or woman from cultures taken over by Phyrexia, men and woman that have voluntarily joined the armor and have been "Altered" by Phyrexsis.

Negators - Sleek, black armored cyborgs with electric powers scaling over their armor. They are fast, and by far the most efficient foot soldiers on the planet. The majority of them lies inside the palace.

Debasers - Flying shock troops with more "modifications" to fly and turn from ground to air attackers.

Defilers - Total mechanoid Phyrexians with no 'decaying flesh' to make them classified under cyborg. While still as hideous as the others defilers have no feelings or higher 'fleshy' emotions as the others and are used for multiple tasks.

Colossi - The phyrexian colossus stands 116 yards tall (that's a football field and then some) and is a towering beast used for the most extreme labor or the hardest battles. They are very territorial and are so big they often step on "little people" without realizing it.
And finally

Dreadnought - The largest and most powerful Phyrexian class. While not as tall as a colossus it is nearly four times long as a colossus is tall, being 422 yards long they have been described as "living mountains". While they are 'snake' like in motion most are able to 'stand' by curling up and put the colossi to shame. Dreadnoughts are not found anywhere but sphere four unless an emergency is taking place.
And lastly
((No good pic of the gremlins))
Gremlins - The smallest type of Phyrexians. A gremlin is 8 inches tall and no wider then half that. It has pointy cat like ears and a sharp pointy tail to accompany its arms and legs. While most are thick and fat looking a few are thin and frail or of medium weight. Although gremlins are bipedal and walk upright like humanoids they run on all fours and scamper about looking for food. They are the ultimate garbage disposal and will eat the most disgusting things mainly, dust, grime, trash, and rotten food. They were designed that way and are phyrexias underground cleaning force. Found on every sphere but the first, eighth, and seventh (rarely on the fourth but they are there) they are shy and timid but are like an ant in strength able to life up to ten times its body mass.
Welcome to Phyrexia. Death awaits.