We’re in Open D Tuning for this one.
A simple, two chord phrase that gives you some really beautiful voicings that wouldn’t be attainable in standard tuning. At the core is a chromatic/semitone movement between minor and major which I always feel has a certain psychedelic quality, especially if it’s extended to 7th/9th chords.
B minor 7 (Bm7)
B flat 9 (Bb9)
The final chord you hear is just the 6 open strings (and you shouldn’t feel “lazy” about occasionally making use of this vibrant convenience!).
If you’re playing electric, whack on the distortion and you’ve got that nimble drop D powerchord fingering at your disposal, which makes this tuning a good combo for your more arty, melodic rock and metal.
Have fun!
The Chord Progression Library - Chords and Progressions for Guitar 
cool though I can only play one guitar tuning from the regular to the the D is a hassle
It’s best not to see it as a hassle because it really can give you more options when writing songs. Once you’ve tuned to open D a few times you’ll be able to tune quicker and it won’t be so much of a big deal. What I tend to do is spend a week or so in one tuning then switch.