Elden Ring DLC Promised Consort Radahn Raptor Talon [No Block, Cheese, Summons] RL149 Blessing 18 

A horrible blemish to an otherwise fantastic DLC.
You should replace the winged sword insignia with it's upgrades and the erdtree favor with a dragoncrest greatshield talisman.
My best advice for this fight is to get really good at phase 1 to save flasks for phase 2 since that phase has borderline unavoidable damage and to not play too greedily. (Advice that I blatantly ignore in this video.)