Polymorph doesn’t let you become a goblin, bugbear or a dragon, it only lets you become creatures with the Beast type (i.e animals).
What beasts can I polymorph into?
10 Best Things To Polymorph Into (D&D 5E)
- Giant Ape. Source: Monster Manual.
- Giant Owl. Source: Monster Manual.
- Tyrannosaurus Rex. Source: Monster Manual.
- Bat. Source: Player’s Handbook.
- Flying Snake. Source: Monster Manual.
- Giant Shark. Source: Monster Manual.
- Giant Elk. Source: Monster Manual.
- Giant Octopus. Source: Monster Manual.
Can a true Polymorph a Goblin into adamantine?
Following on from this question: Can I True Polymorph a goblin into adamantine (and then forge him into a sword?) Casting True Polymorph on an unwilling creature (relevant parts included only):
When does true polymorph become permanent in RuneScape?
Casting True Polymorph on an unwilling creature (relevant parts included only): You transform the creature into a different creature…or into an object.The transformation lasts for the duration, or until the target drops to O hit points or dies. If you concentrate on this spell for the full hour, the transformation becomes permanent.
Where can you find adamantine in the Forgotten Realms?
Adamantine was a jet-black alloy of adamant and other metals. Usually black in color, adamantine had a green sheen when viewed by candlelight or a purple-white sheen when viewed by magical light. It was found only in veins of ore near earth nodes and areas of faerzress in the Underdark. [citation needed]
Can a object created by true polymorph be used?
True Polymorph only states that: The transformation lasts for the duration, or until the target drops to 0 hit points or dies. The steps in practice are: Convert Creature into Object. Use object as consummable material components.