Every tier level of perks requires a number of perks to be unlocked beforehand, and the Particle Deconstruction mod is in the final tier of artifact mods.
To gain access to the Particle Deconstruction mod, Guardians will have to level up their Wayfinder's Compass Artifact 11 times. Combined with the Particle Deconstruction Seasonal Artifact mod, Fusion Rifles in Season of the Lost are an absolute necessity for end-game content. A couple of Fusion Rifles received their own buffs at the beginning of Season of the Lost, while several Fusion Rifle archetypes received separate stat increases.
Destiny 2's Fusion Rifles received a massive rework for Season of the Lost, and the best Fusion Rifles are a necessity for end-game content loadouts.