Glowing

Creatures and items that have at least 1 level of glowing cannot become invisible.
Stealth checks gain one level of disadvantage for every level of glowing creature has.
Glowing creatures and items emit 1 m of harsh light in radius for every level of glowing beyond 6, then bright light for every level above 3 beyond the line of harsh light and finally 1 m of dim light for every level of glowing they have beyond that.