Something Boss Fights but I solo aexel with roaringtempest (thunderous)

I like this boss beside the annoying echo gimmick in which I had to ask about cuz it was ending most my full life runs for no reason beside me not knowing how it works Music used: usually the boss has demetori music in game but I also used demetori here :3    • 【東方 ☯ Instrumental Rock/Metal】Demetori - 星...      • Gram (DJ Genki) - Sigrdrifa (From TWC 2023...   Phase Timestamps: 0:00 Phase 1 1:09 Phase 2 2:05 Phase 3 3:35 Phase 4 5:46 Desperation Move (doesn't take all ur lives I think which is poggers)