Bootlegsnake

Giten summary and basic idea:

A keter class SCP, similar in idea to 610 however rather than being a flesh infection it is a cancerous Hivemind organism that spreads by consuming most kinds of energy. It will target living sentient creatures and begin to convert their body into more of its cancer, however this doesn’t kill the host but preserves their mentality and consciousness, these aspects are then refined and ‘purified’.

The one kept in containment is discovered to not be the source of this creature, however a small strain of it. The true source of it is unknown however if this SCP is released it will have little to no issue fulfilling its purpose and ‘purifying’ everything on the planet.

This creature is quite intelligent and grows intelligent by the days, it can currently speak in full sentences and can use complicated vocabulary easily, it also has knowledge on the English language and can speak it well enough to communicate.