When using any source of Summon Forged Weapon (Tested Forge Strike, Multistrike, Rive, Warpath) during the Lagon fight summon them outside the arena, rendering them useless for dealing damage to Lagon.
To be clear, they summon and function as normal during the adds phase, it is specifically during the direct Player vs. Lagon portion of the fight.
The forged weapons can be seen bunching up at the nearest tentacle blocking the stairs. My guess is that the forged weapon summon skill, lacking a proper target, in fact spawns the weapons underneath the player’s location.
Performance/graphics/etc are all functionally fine, but naturally if you rely on the Forged Weapons for the majority of your damage it makes the Lagon Monolith fight incredibly…difficult.