Beast (Undead Unluck) vs Black Beetle: who would win?

Beast (Undead Unluck) favored — Slight edge (~55%)

Beast (Undead Unluck) · Undead Unluck · Base

Tier

HIGH 7-A

Attack Potency

Large Mountain Level

Speed

Massively Hypersonic+, up to Ftl+

Durability

Large Mountain Level

Black Beetle · DC · Base

Tier

HIGH 7-A

Attack Potency

Large Mountain Level

Speed

Supersonic+, up to Relativistic+

Durability

Large Mountain Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.