When activated it inflicts "Crazed Sorrow" on all enemy Creatures. If Creatures with Crazed Sorrow make a basic attack, they also deal DMG equal to 50% of ATK to adjacent Creatures. After the attack, the Creature's current and Max HP will be reduced by 10% (Capped at 2000 Health). Creatures under the effect of Crazed Sorrow are immune to all control effects. Crazed Sorrow lasts 1 round.
Since Crazed Sorrow does very heavy damage, and essentially grants your creatures an extra turn, it is highly recommended that you level it up.