Assassin's Blade

The wearer of this bracer may draw or sheathe
the blade as a free action.
The blade behaves as a +1 magical dagger, but
when used against an unaware target or to make
a coup de grace, it is treated as having a crit range
of 15-20 and a x4 crit modifier.
This does not stack with other enchantments or abilities that enhance criticals.
"Fear not the darkness, but welcome its embrace."