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Absorbing the crystal's chi and replacing it with your own is a difficult task- but one with potentially huge benefits.
In your time, you have read many cultivation and martial arts manuals- many of them forbidden. Hidden and secret knowledge. One such is the art of <span class="mu-i"><span class="mu-s">Devil Transfusion</span></span>, the process of replacing your chi with the chi of another being or thing. Naturally this is extremely dangerous, and almost all cultivation sects ban or hide this knowledge; even one small mistake can result in chi deviation- such as accidentally mixing your chi and the foreign chi. In worse cases, it can result in the body being unable to create its own blood- thus making the person into a vampire. Or just outright killing them.
Of course, you are an Immortal and a very skilled cultivator! You take the crystal and enter a highly focused state. Using your abilities, you channel all of your chi to one part of your body to allow the foreign crystal's energy to take up its place through your meridians, allow it to warm up your golden core, and flow through your Dantians and lotus points. Finally, you harmlessly expel your old, mortal chi out of your fingertips into the soil around you- hopefully to sate this tree entity and pay it back a bit for stealing this powerful elixir.
Almost immediately, you feel a massive difference. Your body feels charged with some kind of strange, unknowable cosmic energy! You can now survive in the void between worlds in the cosmic realms, and have an increased cultivation base and speed- especially in regards to cosmic level stages. Finally, your blood is now replaced with glowing crystalline light- meaning any wounds you suffer will not bleed but instead simply release a burst of cosmic energy. In darkness, your veins glow very dimly with rainbow energy. This is an unusual change, but hopefully not one that marks you as being too inhuman among your fellow cultivators...
Suddenly, you feel a nasty smell and taste rising from the back of your throat. You puke out dark black vomit which sizzles in the open air- yuck! What do you do?
>Let it happen
>Take an anti-vomiting pill
>Reabsorb the expelled substance?