Jax (League of Legends) vs Flame Reaver: who would win?

Jax (League of Legends) favored — Slight edge (~55%)

Jax (League of Legends) · League of Legends · God Staff Jax

Tier

3-C, up to 3-B

Attack Potency

Galaxy Level, up to Multi-Galaxy Level

Speed

Massively Ftl+

Durability

Galaxy Level, up to Multi-Galaxy Level

Flame Reaver · Honkai: Star Rail · Base

Tier

3-C, up to 2-A

Attack Potency

Galaxy Level, up to Multiverse Level+

Speed

Ftl+, up to Infinite

Durability

Galaxy Level, up to Multiverse Level+

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