1x4- Merlin saves Arthur by drinking from poisoned cup, sick throughout episode.
3x1 & 3x2- Merlin is stung by a serket, almost dies
4x1 & 4x2- Merlin almost dies to protect Arthur (by weird spirit things hard to explain). Bonus: Super whumpy scene where he’s carried by knights.
4x6- Chest injury during fight, worried Arthur. Later kidnapped plus cute Arthur missing Merlin moments and even cuter reunion moment.
5x8- poisoned by Morgana, almost dies, injures leg after being pushed. Arthur asks about limp.
5x10- shot by an arrow in the leg.