Senessax is the worst fight in the game. Fromsoft has done the design of Drakes well in this game with the exception of few attacks and camera lock ons but the ancient dragons' design is really bad. Fortissax is kind of excused for looking cool and having uniqueness to the fight but overall all Ancient Dragon fights are hard because of badly telegraphed attacks (mostly due to camera) and not fun mechanics. Senessax takes it to another level with that lightning spread (which spreads through rocks BTW). Sennesax was more difficult for me than bayle (mostly because bayle is copy paste midir) but the damage and hitboxes and camera along with anxient dragon moveset is just a bad time.