- Make barbaric yawp relevant.
- Create a mechanic requiring perfect timing of diversion/decoy by the entire party.
- Improve the effectiveness of various damage types (blunt, piercing, etc) and build upon this concept. IE mobs that change damage-type resistance/immunity.
- Add dungeon traps that require precise timing and movement to circumvent.
- Require the party to split up and fight X-number of bosses concurrently.
- Dungeons where tunnels/rooms periodically change.