Is it possible to make crafting materials, like adamantine, out of a goblin or such using the True Polymorph spell for the full duration of the spell? On a side note, while adamantine is mentioned in the Monster Manual, I didn't see it in the PHB. Is that something else that will be fleshed out in the DM guide?

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    \$\begingroup\$ I can't find anything against it, but wouldn't it be pretty bad idea? I mean, can't this spell be reversed, dispelled etc? Of so, you are without a sword and there is angry monster next to you now. \$\endgroup\$
    – Mołot
    Nov 6, 2014 at 23:03
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    \$\begingroup\$ @Mołot Or half an angry goblin xD \$\endgroup\$
    – aebabis
    Nov 6, 2014 at 23:13
  • \$\begingroup\$ @acbabis so... messy... All this blood! But on more serious note, lost time and effort on sword was my main concern. At levels when this spell is available single goblin isn't really a problem anyway. \$\endgroup\$
    – Mołot
    Nov 6, 2014 at 23:17
  • \$\begingroup\$ And really, why adamantine at all when most creatures' resistance is removed with a magic weapon which boosts to-hit and damage. Sure it's possible, but by the time it is, it's basically completely pointless \$\endgroup\$
    – wax eagle
    Nov 7, 2014 at 0:10
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    \$\begingroup\$ Why wouldn't you just transform the goblin into the sword and skip the middle step entirely? \$\endgroup\$ Jul 9, 2015 at 19:58

1 Answer 1


I don't see why not.

It's not exactly a practical way of going about things, but it would be possible (by 17th level money isn't really an object). The spell says you can transform a creature into an object. Turning a Goblin into a lump of adamantine is totally within that realm of possibility (tbh, why stop there, I'd dream a bit bigger, and maybe a bit more valuable, though we don't have a gold price on adamantine in 5e at this time).

When the measuring stick of this is literally comparing it to wish, converting a goblin into a hunk of metal really isn't a big deal.

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    \$\begingroup\$ If you're aiming for efficiency, you could always wish that all goblins were adamantine. \$\endgroup\$
    – wax eagle
    Nov 7, 2014 at 0:15
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    \$\begingroup\$ I would advise against that wish. While I'm DM'ing, I would interpret that wish as: "The goblins remain living, mobile, sentient, but are also made of adamantine." Then have the campaign become: How to stop the world from being taken over by adamantine goblins. \$\endgroup\$
    – John Evans
    Nov 7, 2014 at 0:21
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    \$\begingroup\$ @JohnEvans absitively-posilutely. \$\endgroup\$
    – wax eagle
    Nov 7, 2014 at 0:37
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    \$\begingroup\$ @JohnEvans LOOKS LIKE I'VE GOT MY NEXT PLOT HOOK. \$\endgroup\$ Apr 6, 2017 at 13:34

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