Lichdragon Fortissax is a Legend boss in Elden Ring. A giant black dragon with four wings on its back, it can be found by locating Fia in the Deeproot Depths after progressing her questline to its natural end. Even though it's an optional boss, facing it is necessary for the "Age of Duskborn" ending.
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This boss has an arsenal of lightning attacks that can deal heavy damage if you're not careful, but overall is a relatively easy kill if you've already beaten several other dragons and have the typical strategy mastered. Here is all you need to know about Lichdragon Fortissax.
Lichdragon Fortissax is located inside Deeproot Depths, with the nearest Site of Grace being "Prince of Death's Throne." This boss fight is entirely optional, but you'll need to complete Fia's questline and defeat this boss to acquire the "Age of Duskborn" ending in the game.
After facing Fia's Champions in the same arena, talk to Fia and exhaust all of her dialogue options. Doing this will allow you to enter the Deathbed Dream, where the fight will occur. You can summon online players, as well as use Spirit Ashes, to help with this boss fight.
Fortissax is relatively weak against Physical Thrust Attacks. Using a Thrusting Weapon or Heavy Thrusting Weapon is ideal here.
Defeating the boss will net you a whopping 90,000 Runes, and as the boss is a Legend you'll also get its Remembrance. Handing in the Remembrance to Finger Reader Enia in Roundtable Hold will allow you to acquire Fortissax's Lightning Spear or the Death Lightning Incantation.
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Lichdragon Fortissax has a variety of different lightning attacks that it uses throughout the fight. Death Lightning and Fortissax's
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