Generally, celestial bodies should have 315 hit points per mile in radius. Celestial bodies regain 1/10th of their maximum hit points at the end of each round as pieces coalesce back into the main body. After a celestial body is reduced to 0 hit points, creatures have 5 minutes to get off the planet before taking force damage equal to the body's maximum hit points as it collapses. If the body is reduced to its hit point minimum, this damage is dealt immediately.
Sturdiness by Material
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