You are a half-Symbiote. Due to your unique circumstances, Symbiotes are much better connected to you than normal and you can dominate them.
Your power comes from the god of light, not Knull.
As a Half-Symbiote, you and your symbiote are integrated as one, now instead of saying "We are" you say "I am".
This enhances your symbiote shapeshifting ability, letting you shape your body into any appearance, such as stretching your wrist the same as Reed Richards could or regenerating yourself from a puddle of goo.
If you take "Venom The End" upgrade, now those powers apply to you, instead of only your symbiote.