Yannis

Fantastic choice!  Love that band.  Got two of their albums, although I'm not certain how big their discography is. 
This one has been one of the better new wave thrash albums in more recent years.  I revisit this one often!
Black Water Rising - Self-titled
Black Water Rising - "Pissed and Driven"
Nice hard rock with a southern metal flare to it.

Making my way through the sublimnal verses again 

Couch Slut is great live. Saw them in a small dungeon of a club with Imperial Triumphant last year.
Little different styles. Tiamat started as a death/doom outfit and Samael was black metal, but they do have some similarities. Also Tiamat hails from Sweden, Samael from Switzerland. Not sure how much interplay they had to influence each other, but it's definitely possible. Interestingly, they had similar career arcs moving towards a more electronic sound far from where they originated.
If you dig that sound, this might be up your alley. One of my favorites along the lines of very early Samael.
Serpent Noir (Greece) - Sanguis XI
Sanguis XI | SERPENT NOIR | Hellthrasher Productions (bandcamp.com)

Samael and Tiamat were contemporaries. Both formed in 1987. Samael got their first EP out in 1988 with Medieval Prophecy, but Tiamat was the first to get a proper full length out (Sumerian City - 1990). Samael came in a year later with their full length Worship Him - 1991.
 

Fuck yess!!! Love this band because they reminded me of early Tiamat.
Ceremony of Opposites i liked too.

Samael - Blood Ritual (1992)
 

My favourite album from them, Cause of Death being a close second.

Yeah I've seen Obit a few times and have never been disappointed.
 
Obituary - Dying of Everything, 2023, pretty good for a buncha old men in their 50's.
 
Obituary - Darkest Day, 2009. I almost always go with one of the first two or World Demise, I've gotta start working some of these middle/later albums into the rotation. This one's not truly spectacular or groundbreaking, but it's perfectly serviceable.
 

Happy you like them. Yeah it would be exciting to see new stuff from this band. 
 

Sadus - The Shadow Inside (2023)
 

loved this album
 

Summoning - Minas Morgul (1995)