Chaltab
Legend
I can't really comment on Shadowdark and Demon Lord because I don't have copies of them but like I said I think the core engine of 5E is:
- The D&D staple mechanics of Ability Scores 3-18 and d20 resolution rolls
- Proficiency bonus with limited scaling that applies universally to anything you're proficient with
- Bounded accuracy
- Advantage and Disadvantage in place of most numeric bonuses and penalties
- An action economy that treats movement as a fluid and actions as solids.
- Plain language instead of keywords and symbols