It has come to my attention that at this moment the Lightning element is the only element which has only 1 instant cast jutsu. Every other elemental mastery has two of them, which is odd since Lightning is said to have a good balance of damage and speed.
For this reason I think that the Feast of Lightning jutsu should be instant cast, but self stun the user for 1 second. Rather than casting for 1 second and then hitting the enemy, the jutsu would damage instantly but make u vulnerable for 1 second.
Lightning is said to be good at solo scenarios but it is currently lacking in that area, I think this change would help it but still allow for counterplay.