In Elden Ring weapons that heal and are heavy enough to reliably stagger enemies are pretty rare. There are a handful of Talismans in the game that give players self-healing abilities, like the Godskin Swaddling Cloth which procs on successive attacks, or the Assassin's Crimson Dagger which restores Health with Critical Hits.
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The Blasphemous Blade is a Greatsword that can be acquired relatively late into Elden Ring, and thanks to its self-healing abilities and incredibly powerful Ash of War it's one of the best end-game weapons for Faith-based players. By using certain Talismans to stack the healing effect and increase the already-powerful Weapon Skill, the Blasphemous Blade is arguably one of Elden Ring's most broken Greatswords.
The Blasphemous Blade scales equally with Strength, Dexterity, and Faith until upgraded to higher levels, which can be done with Somber Smithing Stones. At +10 the sword has C scaling in both Strength and Dexterity and a B in Faith. Though it might not be upgraded to the max level, it's still important to make Faith your highest stat as the Taker's Flames Ash of War relies on it.
The above table is based on a Level 100 character who started as a Wretch. Having a decent Vigor level at the later stages of the game is essential, and a 20 in Mind means being able to cast Taker's Flames more often. Four points in Endurance helps to offset the weapon's high Weight. With Strength at 25 and Dexterity at 20 the Blasphemous Blade gets most of the benefits of scaling until higher upgrade levels, and a 50 in Faith means a much stronger Ash of War.
At the highest upgrade level, this Weapon Skill can easily do upwards of 1500 damage and knock over all but
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