grandmaster difficulty was not designed for anything else than nightfalls where you just had linear progression.
mythic is harder, enemies are bullet sponges and everything instantly ills you even though i am at 200 power.
its impossible to do the matterspark quest solo.
just delete mythic and leave fabled in.
not to mention for some reason stronghold is not working properly anymore.
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Its easier once leveled. Do locked and no hud. Ignore all other mods.