A GM recently pointed out to me the Growing magical weapon ability:

Once per day, a growing weapon is able to grow by one size category, dealing damage as appropriate for its new size and allowing its wielder to affect creatures one size larger than normal with combat maneuvers limited by size. The wielder is able to use the weapon normally without penalty despite its increased size. The weapon remains at its increased size for 10 minutes.

Does this apply to an Amulet of Mighty Fists, to allow a growth in unarmed strikes? (As you may be able to tell I'm on the hunt for ways to boost my monk's damage output.)

As far as I can tell, there is no reason, RAW, for this to not apply. The text doesn't call out specific weapon types that cannot have this applied to it (as does Keen disallowing non-slashing weapons), and it is a melee weapon magical ability.

  • \$\begingroup\$ You cannot apply a weapon ability to an amulet. If you had the Amulet and also something like enchanted fist wraps, then maybe. \$\endgroup\$ – Marshall Tigerus Apr 18 '17 at 13:20
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    \$\begingroup\$ @MarshallTigerus Please note, it is PF question not 3.5. PF version allows exactly that. \$\endgroup\$ – annoying imp Apr 18 '17 at 19:12

Arguing FOR:

PF Monk, Unarmed Strike Ability

"A monk’s unarmed strike is treated as both a manufactured weapon and a natural weapon for the purpose of spells and effects that enhance or improve either manufactured weapons or natural weapons."

As [equivalent to] a natural weapon the Amulet's abilities could affect it.
As [equivalent to] a manufactured weapon Weapon Growth could affect it.

In Pathfinder, the Amulet of Mighty Fists can specifically be used to "project" melee weapon abilities onto a weapon, so combining it with the "Growing" ability would work quite well.

question for thought (and a time and placed more suited to random debates): why were fists not simply declared "natural weapons", to eliminate so much of this dodging around?

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  • \$\begingroup\$ To answer the question at the end: to avoid monster feats. \$\endgroup\$ – ShadowKras Apr 18 '17 at 12:18
  • \$\begingroup\$ and yet isn't there a huge chunk of monster feats anyway? eg, "multi-weapon fighting". anyway, it was just a throwaway thought that feels like it would have eliminated a lot of problems... tho i'm sure there are at least as many problems that would have arisen. \$\endgroup\$ – tzxAzrael Apr 18 '17 at 12:23
  • \$\begingroup\$ I meant to avoid players taking monster feats. \$\endgroup\$ – ShadowKras Apr 18 '17 at 12:58
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    \$\begingroup\$ What reason do you have to suspect that growing is unique among weapon special properties and might not function with an amulet of mighty fists the way literally every other weapon special property does? After all, it is hardly the only one to use the word “weapon” and in any case an unarmed strike is a weapon. \$\endgroup\$ – KRyan Apr 18 '17 at 18:26
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    \$\begingroup\$ Isn't the ability to "project" enhancement bonuses/melee weapon special abilities onto natural weapons/unarmed attacks the one and only ability of Amulet of Mighty Fists? If not what is it used for then? \$\endgroup\$ – annoying imp Apr 18 '17 at 19:26

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