What one item on the AAY is their source of strength?

[Girasoles]

Those horns. They allow him to tap into the power of nature and transform into his elk form. Without them, he's powerless

[Visher Leonidas Wulfgar]

Her Hat, It allows her to summon many kinds of things like monsters, shields, and sort.

[Z e p h y r]

His Axe. It allows him super strength and immortality so long as he's holding it.

[henred5]

His hammer, it was a great gift from his mentor, without it his memory will doubtlessly fail and he will forget all of his mentor's teachings.

Her golden blonde like hair is soo bright and uplifting that even in the darkness, it will bring light - even when cut, though if short the light is kinda dim.

[Girasoles]

@ Zeph
Her Watch. It allows her to slow down, rewind, or fast forward time. Without it her body will become a pile of dust since she's from far back in the past.

@ Hen
Her hair pin. It was a gift from her mother, a great necromancer. It gives her the ability to give all corpses she raises a fresh, floral scent.

[Emma of Bainbridge]

The gold chain on her waistcoat. It comes from a stash of Aztec treasure, and bears a curse that will enact horrible vengeance on any who dares to harm the wearer.

[Taran Renard]

I'm pretty sure its the lake behind her...

[Hunter9376]

The gaurdian spirit that gives him his powers when he summons it.

[Super_noob_e]

Their glowing blue gauntlet probably.

[Montemorencye]

The glasses, duh.

[Visher Leonidas Wulfgar]

Kaya the Cat can transform into a large Liger and protect her.

[Ash Dunn]

People assume it's his axe but it is actually the jewel within the axe that gives him his great strength and endurance.

[Fyerluna]

The red cross in the helm. It's made of the blood of the god of creation and there's only one.

[Whispering Mink]

The red bow
It activates the magical girl summoning sequence and her current weapons

[xxNew York]

The necklace - it holds a vast amount of magic.