The Luminary vs Chaos (Riordan): who would win?

The Luminary favored — Favored (~65%)

The Luminary · Dragon Quest · Act 3 and Post-Game

Tier
2-C
Attack Potency
Low Multiverse Level
Speed
Massively Hypersonic, up to Massively Ftl+
Durability
Low Multiverse Level

Chaos (Riordan) · Percy Jackson · Base

Tier
LOW 2-C
Attack Potency
Universe Level+
Speed
Omnipresent
Durability
Universe Level+

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