The Sword from the stone gives huge ATK but no MATK at all. However, it also gives +30% Light Damage. The problem is that there don't seem to be any ATK-based Light attacks.. except for Holy Lance. Which you cannot use without a spear, apparently. This means that the bonus to Light damage on the Sword from the stone is kinda useless, since if you're equipped with it, you're gonna use ATK abilities, not MATK ones.

A few possible suggestions to make this feel better:

1) Add one or more other ATK-based Light attack, that the sword can actually use. Paladin-like smite abilities are always cool.

2) Allow Holy Lance to be used with non-spear weapons.

3) Make the Sword from the stone give MATK.

4) Make the Sword from the stone count as a spear, just for purposes of actually working with Holy Lance.

Also as a side-note, it would be cool if you fixed the name of the Sword from the stone to be Sword from the Stone. It makes it more dramatic, and should be capitalized correctly ^^