|I think that Cenred didn't bother because he wasn't planning on joining in the fight at all (just like he didn't in 3x02). And Morgause doesn't seem to need to since the army is bound to her and she has magic to take care of herself (and it's not that she is gonna get close to the real struggle either). I'd say Morgause goes down and the army goes down with her. I take it Merlin will have to do with that, while Arthur does his best to survive wielding Excalibur.|
I think you're right! Morgause has so much faith in her ability she would feel no need to make herself immortal. As she did the magic, she is in overall control so Merlin needs to get to her and kill her using magic whilst Arthur holds back the Army with Excalibur, as for what the others are going to do without a magic sword is anyone's guess!