Ok so endgame spoilers here, so if you haven't completed the main quest don't read further






















So, I got the Elder Scroll and learned Dragonrend.
When I use the shout, Alduin lands like he should, but when I attack him, he doesn't take ANY damage.
I tried shouting, magic and weapons but none of it hurts him, and yes he was affected by Dragonrend

I tried to revert to an earlier save and it still wouldn't work T_T

Anyone else have this problem, and/or know a way to fix it?