Jolting Arms is a heavy armor set. When you block an attack, you have a 50% chance to charge your arms, causing your next Bash ability to deal an additional 5805 Shock Damage and increase your Spell Resistance by 6450 for 6 seconds.
The Jolting Arms set is part of the base game. It drops in Tempest Island in Malabal Tor. Each set item is bound on pickup. You can acquire heavy armor, weapons and jewelry of this set in the Ancient Elf motif style.