The Cursed Child is found inside the Revered Beacon dungeon, which you can find inside the Abbey in Mortal Shell 2. The dungeon involves a gimmick where you need to avoid the rotating light from atop a tower in the middle area. Make your way up to the top of this tower, all while avoiding the light and beating back enemies, and the Cursed Child is yours to claim. Unlike other Sidearms in Mortal Shell 2, this one acts more like a lantern than a gun, and you can do some pretty interesting stuff with it once you get the right Tarstones.
First, you need to have reached the Abbey in the southeastern quadrant of the world map. To do this, head to the Mammon region, then use the bone gate near the trebuchet camp east of the Outskirts of Mammon Beacon.
Once you reach the Abbey Entrance Beacon, head through the front gate by pressing a button on the wall, then fight back the two crossbow Sesters that ambush you. Push forward, and either evade or defeat all the enemies until you make it to the battlement halfway through the main path (it's past the dual-wielding enemy and before the big cultist with the giant mace).
If you continue toward the giant corrupted gate, you'll end up at the Sester's Gate Beacon, which contains the Black Needle weapon.
Follow the battlement to the end, and you'll arrive at a tower with an elevator inside. Go down, exit the tower, then turn left. The Revered Beacon entrance is just up ahead.
As for the Revered Beacon dungeon itself, all you need to do is reach the top of the tower with the miniature sun on top. Use the environment to hide from the searing light, and take out any enemy along the way. Once you make it to the top, you can pluck the Cursed Child from its pedestal.
So far, I've unlocked two Infusions and one Ability Tarstone for the Cursed Child:
What's neat about the Cursed Child is that a single blast from it can immediately trigger both Curse and Bloodcurse. For the unaware, Curse negates the enemy's next attack and reflects all the damage back to them. Meanwhile, Bloodcurse works like a traditional Soulslike Bleed proc, which deals a burst of damage upon reaching full stacks.
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