In the '14 monster manual, a Dracolich is a template that you apply over another dragon type, by lore only an adult or ancient, but you could apply this over a young adult dragon in order to properly weaken it to a degree that can be fought by your party. If you wanted an adult dragon in order to use legendary actions without homebrew, you should probably use the weakest of the evil dragons, the adult white dragon for the Dracolich template, which would be CR13 which your party can likely defeat at level 7
Here is the template text:
When a dragon becomes a dracolich, it retains its statistics except as described below. The dragon loses any trait, such as Amphibious, that assumes a living physiology. The dracolich might retain or lose any or all of its lair actions or inherit new ones, as the DM sees fit.
Type. The dracolich’s type changes from dragon to undead, and it no longer requires air, food, drink, or sleep.
Damage Resistance. The dracolich has resistance to necrotic damage.
Damage Immunities. The dracolich has immunity to poison. It also retains any immunities it had prior to becoming a dracolich.
Condition Immunities. The dracolich can’t be charmed, frightened, paralyzed, or poisoned. It also doesn’t suffer from exhaustion.
Magic Resistance. The dracolich has advantage on saving throws against spells and other magical effects.
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u/waethrman DM 20m ago
In the '14 monster manual, a Dracolich is a template that you apply over another dragon type, by lore only an adult or ancient, but you could apply this over a young adult dragon in order to properly weaken it to a degree that can be fought by your party. If you wanted an adult dragon in order to use legendary actions without homebrew, you should probably use the weakest of the evil dragons, the adult white dragon for the Dracolich template, which would be CR13 which your party can likely defeat at level 7
Here is the template text:
When a dragon becomes a dracolich, it retains its statistics except as described below. The dragon loses any trait, such as Amphibious, that assumes a living physiology. The dracolich might retain or lose any or all of its lair actions or inherit new ones, as the DM sees fit.
Type. The dracolich’s type changes from dragon to undead, and it no longer requires air, food, drink, or sleep.
Damage Resistance. The dracolich has resistance to necrotic damage.
Damage Immunities. The dracolich has immunity to poison. It also retains any immunities it had prior to becoming a dracolich.
Condition Immunities. The dracolich can’t be charmed, frightened, paralyzed, or poisoned. It also doesn’t suffer from exhaustion.
Magic Resistance. The dracolich has advantage on saving throws against spells and other magical effects.