Resist Lightning increases the Paladin's lightning resist. It also gives a passive bonus. For every two hard points invested into Lightning Resist, the Paladin gets a passive +1 to maximum lightning resist that is active at all times regardless of whether the aura is turned on or not. So with 20 points invested (not counting + skill items), the maximum lightning resist of the Paladin would be 85 instead of the regular 75.
Lore[]
Even the elements of nature must yield before the glory of the Light. When a knight of Zakarum has manifested this aura, he and his allies undergo a lessening of their body's natural conductivity, protecting them from attacks empowered by electricity. [1]
References[]
↑Diablo II Manual, page 83. Blizzard Entertainment, 2000.