From Shadow Era Wiki

Card_No: se179
Rarity: Epic
Name: Crescendo
Type: Hero Item - Armor (Mage/Wulven)
Cost: 6
ATK: 1
HP: 6
Ability: At the start of each of your turns, Crescendo gains +1 defense. At the end of your turn, if Crescendo has 5 defense, it is destroyed and all opposing allies are killed.
Flavor Text: "I have to warn you, it's...slightly unstable..."