The Lightning Umbrella is one of BoBoiBoy's powers. BoBoiBoy accidentally summoned Lightning Umbrella when trying to summon Lightning Kris. In Season 3, Episode 18, BoBoiBot summoned a lightning umbrella to to protect him and Adu Du from water splash from BoBoiBoy Water.
Lightning Umbrella is like lightning kris. But unlike that latter said, this one is a umbrella.