Luden's Tempest is a mythic item in League of Legends. Luden's Tempest costs 3200 gold and grants 80 Ability Power, 6 Magic Penetration, 600 Mana, 20 Ability Haste and a Unique Passive (Echo).
+80 Ability Power
+6 Magic Penetration
+20 Ability Haste
Unique - Echo: Damaging Abilities deal magic damage to the target and 3 nearby enemies and grants you Move Speed. Dealing ability damage to Champions reduces this item's cooldown.
Mythic Passive: Grants all other Legendary items Magic Penetration.
Limited to 1 Mythic item.