Path of War: Mithral Current

[Sir Dragoon]

Which class even has access to Mithral Current besides for prestige classes? I couldn't find it in any of the classes or archetypes.

[DungeonmasterCal]

The only place I find it is in the Martial Traditions section under the Lens Maker Society. I may have overlooked it, but certain Martial Traditions favor one Discipline over the others. So the character you want to play may possibly have to be a member of that Martial Tradition. I personally don't enforce that rule, allowing all disciplines to be available to my players, but that's just me.

Lens Maker Society

[dragonhunterq]

Bushi class template for stalker, warder or warlord.

Warpath follower for inquisitor and warpriest if your deities favoured weapon is a mithral current discipline weapon

Failing that any class can swap a discipline with this trait.

[Aldrakan]

Several of the archetypes for non-initiating classes get it:

Rubato Bard, Myrmidon Fighter can pick it, Roil Dancer Kineticist, Monk of the Silver Fist, Hidden Blade Rogue

[Sir Dragoon]

Thank you so much for the answers! So just societies, subject to DM approval, and non martial archtypes, as I suspected.