You have been implanted with a sample of Phazon, a corruptive substance with a number of outstanding and dangerous properties. Normally taking the form of glowing blue fluid, ores or crystals, it is in fact a pseudo-organic pseudo-mineral superorganism capable of self-replication, and possesses both highly mutagenic and energy-generating properties. It is also highly radioactive, volatile, and toxic and corrosive to most life on top of that, killing many creatures that touch it and mutating the ones that survive into monsters. While you specifically will be exempt from the more lethal effects due to being considered this particular strain’s “progenitor”, others will not be so lucky.
As the Phazon spreads inside you, it will gradually replace your ordinary flesh and blood with itself, enhancing your overall capabilities and granting the occasional beneficial - if sometimes disturbing - mutations. During this process, you will find yourself developing a number of abilities, such as generating and discharging Phazon energy, spreading your own internal supply to corrupt your surroundings, and even manipulating the Phazon in an area, such as forming solid Phazon constructs or controlling corrupted creatures and machines. This process can be accelerated by retaking and absorbing excess Phazon from any corrupted surroundings and creatures, though be warned that ‘overfeeding’ can lead to both physical and mental instability.
At the height of your development, after becoming a being of solid Phazon, you will find your body slowly stabilizing and reinforcing itself, skin forming into durable Phazite and internals shifting towards newer, stranger functions - and then after that, beginning to develop its own miniature Phazon Core like those of Leviathans, substantially increasing your output when fully formed. Once complete, your form will be similar to that of Dark Samus in miniature; resilient, needless, and possessed of an array of abilities that make you a terror to fight personally, with only outside forms of Phazon-based weaponry being capable of getting through your defenses.
As one last note: Phazon’s chaotic nature tends to interact very strangely with environments possessing exotic and/or unstable energies, with Aether’s split into two dimensions being a prime example. Should the substance be introduced to other, similar locales such as the Warp, or otherwise areas where reality is fluid or unstable, such as Shardspace, similar reactions may occur in the future.