Acheron vs Welt

• Burst kit built around one Ultimate: Rainblades into Stygian Resurge clear packs while ignoring Toughness type and applying all-type RES shred for the whole sequence—so she stays viable even when Lightning is not on the weakness list.
• Trace A4’s 1.6× personal damage multiplier (with two other Nihility allies) sits outside normal DMG% stacking, so her ceiling does not depend on borrowing Robin, Ruan Mei, or Sparkle from the other Memory of Chaos side.
• Debuff teammates double as fuel—every ally application feeds Slashed Dream and Crimson Knot—so well-built Nihility cores keep Ultimates cycling in MoC and Pure Fiction without Energy-battery supports.

• Full A4 scaling wants three Nihility characters on the roster (E2 lowers that to two paths total); swapping in Harmony for the second Nihility slot only works with well-built supports and still forgoes part of her multiplier.
• Most of her damage is booked into one Ultimate—Rainblades that remove too few Crimson Knot stacks, or hit the wrong enemy in multi-target fights, can waste the bulk of the rotation.
• Basic ATK and Skill ratios are modest compared with many newer 3.x carries; she climbs tiers through debuff-fed stacking, type-agnostic break, and RES shred during Ult—not steady single-target Skill spam.

• Ultimate “Synthetic Black Hole” hits every enemy on the field in one cast—level this before polishing filler traces.
• Skill “Edge of the Void” rolls a base-chance debuff that wants Effect Hit Rate—that is how Welt applies pressure between Ultimates.
• Talent “Time Distortion” When hitting an enemy that is already Slowed—ignore it and Welt plays like a worse generic Nihility unit.

• Several Welt effects roll “base chance”—without enough Effect Hit Rate, Exposed/Shock/DEF shred simply misses on tanky bosses and the rotation feels empty.
• If Energy or Skill Points starve “Synthetic Black Hole”, Welt spends turns on Basics and the kit’s advertised multipliers never show up on the combat log.
• Spamming “Edge of the Void” every turn without watching Skill Points strands the rest of the team—Welt is often the SP sink.

Light Cone

Along the Passing Shore

Relics

Pioneer Diver of Dead Waters (4pc) + Izumo Gensei and Takama Divine Realm (2pc)

Body

CRIT Rate%

Feet

ATK%

Sphere

ATK% / Lightning DMG%

Rope

ATK%

Substats

CRIT Rate ≥ CRIT DMG > ATK% > SPD (only if using SPD-set tech)

Light Cone

In the Name of the World

Relics

Pioneer Diver of Dead Waters (4pc) + Pan-Cosmic Commercial Enterprise (2pc)

Body

Effect Hit Rate

Feet

SPD

Sphere

Imaginary DMG%

Rope

ATK%

Substats

EHR (to threshold) > SPD > ATK% / CRIT