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Message: <blockquote data-quote="Upper_Krust" data-source="post: 9868057" data-attributes="member: 326">Agreed.You don't always have to use the opposite  - its just a handy rule of thumb. But each Immunity MUST be accompanied by a Vulnerability:ie. if Tiamat is Immune to Acid, Cold, Fire, Lightning & Poison then she is probably Vulnerable to Force, Necrotic, Psychic, Radiant and Thunder damage.Or alternatively she might just have one Immunity that randomly changes each turn (in her Chaos/Primordial form).Under my system Dragon's don't necessarily need Immunity because of Damage Threshold.A 60HD Ancient Red Dragon with only Fire Resistance and Damage Threshold 18 is effectively Immune to 36 points of Fire damage. Tiamat 120 HD (for 5 headed LE Intermediate Goddess form) would have base Damage Threshold 36, thus 72 for just giving her Resistances if you didn't want all the Vulnerabilities and remember Vulnerability is  'only' +50% in these rules now (recent change after playtesting).</blockquote>