You wake up in the body of a slime. Your body is now composed of homogeneous cells that can adapt to any tasks required. Your consciousness is housed within a small core. As long as your core is intact, you are able to survive. In it's base form, your flesh is highly resistant to blunt trauma and corrosive substances but weak to bladed weapons and high energy attacks like lasers or fire. It can be hardened to increase your resistance at the detriment of flexibility.
You are able to shape your body within the limits of your available mass which can be shifted in and out of your core for storage. If you absorb the blood or flesh of another being, you can shapeshift into their form and integrate their biological abilities to your repertoire. With practice, you will be able to mix-and-match features from multiple templates.