I just beat the final boss but it says I have 99%. Who is the last enemy?

OK so I just got this game two days ago enjoying the gameplay however after my first area its not letting me properly pull out my pause menu anymore it will work on launch if I am quick enough but than it just disappears without reason and I can't even bring it back out and it moves while i have the pause menu up....

I bought the game with the full intention of refunding, but I'm 4 hours in and am completely hooked. It feels like Astlibra with less dialogue but better animations. What's wrong with it? Why mixed? Why so few players? My only problem is that it doesn't support keyboard prompts, but it's like, a minor issue....

Eruption II and bind II needing 2 copies of eruption but i have rank 3 eruption learnt and the gauntlet and cant get a second eruption??

Aside from: 1. Iron ore 2. Refighting the first boss for large mass of Tamahagane -> three Tamahagane Is there an easier way to farm it? I saw some old videos and posts about the dungeon "bed of Fungi" but that dungeon never drops any treasure chest at the end, just some Virtue Wolf "boss" (I use the term boss very lightly because it's just a wolf enemy and some mobs) fight. Was it changed/patched?...