This spell makes a single weapon incredibly sharp by reducing one of its
physical dimensions to an infinitesimal measurement. The dimensional blade can slash through matter with as much effort as it takes to wave a stick
through the air. Even stone and iron can be carved to pieces with ease. The spell
can be cast on almost any hand-held slashing (type S) weapon, as well as a few
thrown weapons of this type, such as the chakram, shuriken, or a hand axe.
Against creatures, the dimensional blade ignores any portion of Armor Class derived from armor itself; only magical and
Dexterity adjustments affect the opponent’s AC. For example, a warrior in chain mail +2 with a Dexterity of 17 is normally AC 0, but against the dimensional blade he
only applies the 3-point adjustment for Dexterity and the 2-point magical
adjustment, for a total AC of 5. Creatures wearing purely magical armor (such as bracers of defense) may keep the full magical adjustment. Monsters with thick or toughened
hides, such as dragons, may lose part of the Armor Class at the DM’s discretion. The
weapon gains a +2 bonus to attack and damage rolls in any event, but the
wielder ignores any Strength-based combat adjustments—muscle power doesn’t help the
blade at all.
The dimensional blade is also quite effective against inanimate objects. Any object with a diameter
or thickness smaller than the blade’s length must make a saving throw vs.
disintegration when struck, or be cleanly severed in twain. Larger objects can be
sawed through or sliced away at the rate of about 5 cubic feet per round. It’s
dangerous to attempt to disarm a dimensional blade; the weapon used must make an item saving throw vs. disintegration or be
destroyed.
Finally, the blade is also effective against phased or ethereal creatures
since part of its existence is forced into the Ethereal Plane. If the wielder has
some way to detect creatures concealed in this way, the blade can strike and
affect them normally, but without the power to negate Armor Class or other combat
bonuses.
The wizard must touch the weapon to be affected by the spell, but afterward
anyone may wield it. The material component for this spell is a razor-thin shard
of glass.
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