A more powerful and specific version of a charm monster spell, dragon mastery allows a wizard or priest to enter a magical battle of wills with the affected dragon. The outcome is anything but certain, but the more powerful and charismatic of the two gains power over the lesser.
Dragon mastery affects all true dragons, false dragons, wyrm, linnorms, Oriental dragons, wyverns, drakes, and draconians. The spell requires a single dragon scale (of an age at least equal to the target dragon's) and a silver crucible to burn the scale in. The spell has no effect on non-draconic monsters.
When the spell is cast, both caster and target must make an immediate Charisma check. The caster subtracts his level as a spellcaster from the roll, and the dragon subtracts its age category (half its hit dice for lesser dragons). If the caster rolls lower, he has mastered the dragon and can command it to undertake whatever actions he likes. (Suicidal actions or actions requiring the dragon to disclose the location of its hoard immediately cancel the spell's effect.) If the dragon rolls lower, it has dominated the caster, and can likewise command him.
In both cases, the spell lasts as long as an equivalent charm person spell would last, according to the loser's Intelligence and saving throws. See the description of the charm person spell in the Player's Handbook for more guidelines on saving throws for this spell.
| Intelligence | Check Every |
|---|---|
| 3 or less | 3 months |
| 4 - 6 | 2 months |
| 7 - 9 | 1 month |
| 10-12 | 3 weeks |
| 13-14 | 2 weeks |
| 15-16 | 1 week |
| 17 | 3 days |
| 18 | 2 days |
| 19 or more | 1 day |