About Plague Spark - Cobalt Jewel Rarity: RAREPlague SparkCobalt JewelItem Level: 47Implicits: 010% increased Damage6% increased maximum Energy Shield5% faster start of Energy Shield Recharge Poe Plague Spark - Cobalt Jewel Builds List Poe Builds With Plague Spark - Cobalt Jewel. Poe 3.9 Metamorph Occultist Vortex Build [POE 3.9] [Witch>Occultist] [By Eznpc Builder] - Dec,19,2019 20/2320/2020/220/2020/18