Magical Devices For Everyone #10

Dressed up in new gear you leave the store. So now that you are on your way to become a real mage don't you need a wand or something? It's what magic is all about after all! So let's continue our shopping spree and get you a magical weapon. Jelly explains how they work: "They have different designs but work all the same. Attach the gem I gave to you (fire, ice or nature) as the main source of power in the center of the weapon. Then you fill it with magical beads as ammunition for charms. The bigger your spell the more beads you have to use, so choose wisely! The weapon store is not far away."
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As you enter the shop, the Japanese Sailor Moon theme song is playing loudly and it looks like you just fell into the Moon Kingdom. All items are displayed on beautiful crystals - the owner must be a real fan! 
"Hello! I am Vince, how can I help you?" A tiny kind looking guy with red hair askes. "I think one of these will be perfect for you!"

- Hammer: Spells you cast are even stronger
- Gun: Spells you cast are cheaper
- Wand: Can hold more ammunition

Which one will you pick and what would be your first charm?