The lightning affinity is associated with speed, power and weather. Notable examples are Lightning Damage, Haste and Storm.
Speed
After using lightning spells for some time, you develop better running skills. As you delve deeper, you notice your speed becoming faster and faster.
Affinity: Lightning
Range: 1 - 100 %%
Damage in Water
Having fun with lightning magic has made you less suitable for water. You will take damage in water, though not enough to kill you on its own.
Affinity: Lightning
Range: 50 - 100 %%
Step Assist
Becoming part lightning, you are now able to step up 1-block slopes.
Affinity: Lightning
Range: 100 %%