D#. Or E flat. Same scale, same key. Or you can tune down a half step and just play it in the key of D and it will sound the same as if you were actually playing it in D#. The chords are D#-G#-A#, OR Eflat-Aflat-Bflat. If you tune down 1/2 step then play D-G-A.
what is the key signature for the D sharp scale?