Aside from it being a “Dungeons and Dragons” trademark
For me, it’s the animation or graphics.
I love when the transitions of when the monsters are mid action and you kill one.
Example: when the ogre is mid banging his chest and I kill it, the transition from banging to death is cool. So is Argathakul’s death, is really detailed. You feel his head slam against the ground and slowly slide.
The transitions graphics from room to room. You get a sneak peek of more of the structure, art, etc.