Electricity resistance increases at level 6, at level 12, and finally at level 20.
At 6th level, you gain resist electricity 10.
This resistance increases to 20 at 12th level.
At 20th level, you gain immunity to electricity.
"(Ex)" means "Extraordinary Abilities", which are nonmagical. They are, however, not something that just anyone can do -- or even learn to do -- without extensive training.
Effects or areas that suppress or negate magic have no effect on extraordinary abilities.
Because this is a Granted Power from a Domain, it may function like a Feat but it is awarded automatically when a cleric with the Air Domain reaches the relevant level. It does not use a Feat slot.
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