The enchantments placed upon this instrument make it indistinguishable from a normal one; and even if its magic is detected, it cannot be told from an instrument of the bards until it is played. 

If the proper chords are struck, the lyre' will negate the effects of a horn of blasting, a disintegrate spell, or the effects of 6 rounds of an attack of an earth elemental—all as pertains to constructions. Such playing of these negatory chords can be done once per day. 

The lyre' is also useful with respect to actual building, of course. Once per week its strings can be strummed so as to produce chords which magically construct buildings, mines, tunnels, ditches, or whatever. The effect produced in but 3 turns of such playing is equal to the work of 100 men laboring for 3 days. 

If a false chord is struck, all effects of the lyre' are 20% likely to be negated. A false chord is only 5% likely once the character knows the proper ones, but if disturbed by physical or mental attack while playing, the likelihood rises to 50%.