Kiran (Fire Emblem) vs Contumelia: who would win?

Contumelia favored — Favored (~65%)

Kiran (Fire Emblem) · Fire Emblem · Book I

Tier: 1-C
Attack Potency: Complex Multiverse Level
Speed: Superhuman, up to Massively Hypersonic+
Durability: Unknown

Contumelia · Ben 10 · Base

Tier: 1-C, up to 1-B
Attack Potency: Complex Multiverse Level, up to Hyperverse Level
Speed: Immeasurable
Durability: Unknown

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