a Psionic spider gland has been implanted into your body, giving you extra spider like abilities
you can always toggle between your regular form and your spider form. When in your spider form your eyes will turn completely dark and 6 new smaller eyes will appear on your face, from your back 8 spider limbs which are unable to grasp will grow as well. when in the spider form, any normal person that isn't hostile towards you will have to make a CON Spell save DC saving throw because you are unsightly, on a failure they are frightened towards you.
when on your spider form you will gain this next few abilities:
30ft of climbing movement
advantage on: Acrobatics, Perception, Investigation, and Intimidation
Bonus action: Spider Bite: STR or DEX+PROF to hit. on hit 1d8+STR or DEX. attacked creature must make a CON Saving throw with your spell save DC, on failure they also take 2d8 psionic damage
Able to cast Disguise Self without spending a spell slot once per long rest
You get 3 slots to cast Psionic spells every long rest, these spells can be casted in regular or spider form and consist of: Silence, Mirror Image, and Invisibility
When in Spider Mode, a 5 minute in game timer will start which can only be reset when taking a short or long rest, of satisfying your hunger. once the time is up, you will enter a frantic hunger and will need to bite down and consume any living flesh that you can bite down on. You are stuck in spider mode until your hunger is satisfied