Still want my exploding weapon from God of War!

Explosive Item 5+

Evocation Magical
Usage etched onto a weapon that throws projectiles

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When you etch this rune onto a weapon that shoots a projectile, the projectile is surrounded in energy that explodes on contact. This does additional 1d8 damage of the same type as the weapon.

Explosive Item 7

Price 360 gp
Craft Requirements You are an expert in Crafting.

Explosive Item 14

Price 4300 gp
The projectile does an additional 2d8 damage of the same type as the weapon.
Craft Requirements You are a master in Crafting.

Explosive Item 20

Price 70,000 gp
The projectile does an additional 3d8 damage of the same type as the weapon.
Craft Requirements You are legendary in Crafting.

Thoughts?