I want to know before I spend 10 minutes getting to a dungeon only to find that a monster doesn't exist/doesn't drop anything...
- Moss giants (In Varrock Sewers)
- Chaos Druids (In Taverly Dungeon and Edgeville Dungeon)
- Hill Giants (In Edgeville Dungeon)
- Skeletons (In Edgeville Dungeon)
- Hobgoblins (South of Falador and Edgeville Dungeon)
As far as I know Chaos druids do not drop herbs.