Your idea of "HARD" is ridiculous. The enemies are just bullet sponges that do WAY too much damage. It takes literally 30-45 minutes to kill one boss because you have 0 ammo. It all gets used up on 2 yellow bar enemies. Tone it down a bit. It shouldn't take half an entire magazine of grenade launcher ammo to kill a freaking yellow bar enemy. Every boss feels like a damn dungeon boss. Why does it take us players to figure this out? Can't you think for yourselves?
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Mythic is a waste of time anyway. I did a couple quest and the rewards was underwhelming. It really takes a good build though. I saw you use the Melas Panoplia, which is cool but not necessarily the best in high difficulty. The perk is a bit hard to keep up and maintain and survivability really rely on chaining the kills quickly and creating sun spot. Which is hard when even red bars are bullet sponge.