Discordance
Note: If successful, your target will lose a percentage of its skills and stats. The percentage lost is dependant on your Discordance skill. For instance, at 50.0 skill, the target loses 10% from all stats and skills; and at 100.0 skill the target loses 20% from all stats and skills. Once the effect wears off, the target's skill and stats will return to normal. (Does not affect player characters.)
Once Discordance has been used on a target, the bard must remain alive, visible, and within range of the target or the effect ends.
Regarding creatures with “Dragon AI” (such as daemons, drakes, hellhounds, nightmares, and, of course, dragons): if at any point the bard moves while using any barding song, that may compel the creature to retarget on the moving character.
Discordance uses the same success/failure calcuation formula as Provocation, so training methods are identical in terms of what creatures to discord at what level.
There are now Discord Training Elementals in Insula, located on the east side of the New Player Dungeon building.
I recommend using exceptionally crafted instruments only to maximize your gains.