Your Dexterity score increases by 2 and your Charisma score increases by 1. An ability score cannot be increased beyond 20 this way. In addition, your creature type changes to undead. Spells and abilities that state effects or conditions specifically regarding Undead of a specific CR have no effect on you.
If a spell or ability other than your own would cause you to gain Hit Points, you gain that many temporary Hit Points instead. For example, if your hit point maximum is 50 hit points and you are currently at 40 hit points, if you are healed by an ally for 23 hit points, you only gain 10 temporary hit points. If you are reduced to 0 hit points and fall unconscious as a result, any healing you receive will stabilize you and leave you on 1 hit point and unconscious. Furthermore, you cannot die from old age and you do not require air, food or drink. .
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