I've been everywhere as far as I can tell, but I am missing a sol shard and another item. Any help finding these would be appreciated.

I find the Strange Totem in the Prison Cell and think it's the key to "Recover Forbidden Knowledge" but it's not. Did I miss anything else?

Guys, I died fighting the poacher when I needed one more hit, but the bear took care of him for me. However, after respawning and going back to the boss, he's gone, but there's no key on the ground. Restarted the game and same thing, empty arena boss. Any ideas how to fix this other than restarting the whole game? ...

I'm exploring the apex outpost and make it to the boss of the area, but the rest spark is behind a door that requires the outpost key. Same for another door near the fishing spark in the forest. Thing is, I haven't found the key yet. I've explored the mines, the mountains, even the super jail. Does the boss drop it or is the key somewhere else? I hate having to backtrack through the entire area to fight the boss....

Is there any information on the length of the game? I would like to buy it. But would hate to spend the money for a 4-5 hour experience.