Sepulcher Only, Death mode Scal
So this is 1 of the dumbest ways i've fought Scal ever.
This was a run that @YARDlS is doing at the time of posting this, and in his discord server we were theory crafting on how you could possibly kill Scal or Exos with Metastasis (Sepulcher summon) and istarted testing out what we had discused there, and this is the winning attempt after a lot of thinking and strategizing.
So this Scal fight had 1 majot problem, and that's that your only source of dps can actively try to kill you with the boss if too many hearts stack up, so usually you'd kill them to not let that happen, but with Sepulcher being the only weapon you can use in the challenge that is not possible. And just de-summoning Sepulcher by right clicking the summon buff also is banned, since it would make the run not a challenge, so the only way to get around this is to force a natural despawn, by having Sepulcher go off the world border, which only happens if Sepulcher isn't currently aggroed on you, and the enemy that it's aggroed on goes off the edge, in this case that is Scal, making dodging way harder on every despawn, since you can't react to anything she is doing off screen.
Put your thoughts and any questins in the comments, if something comes to mind.
Streamed at: / b0ne_r3aper