It seems like you're having some issues with the Linux Runtime files in Steam and struggling to get your game, Dreamscaper, running smoothly. I'm here to help you troubleshoot!

Firstly, let's summarize what you've tried so far:

1. Emptied space on both internal and external storage.

2. Went to desktop mode and emptied the download cache.

3. Ran `steam -reset` in Konsole.

It sounds like none of these steps resolved your issue with the Linux Runtime files causing problems in Steam.

Since you're experiencing issues with the game running, I'd recommend trying a few more things:

1. Check the Dreamscaper community forums or support page for any known issues related to Linux Runtime files. You might find a solution or a workaround mentioned by other players.

2. Try updating your Steam client to the latest version. Sometimes, updates can resolve compatibility issues with specific games or runtime files.

3. If you haven't already, try restarting your computer and then launching Steam again.

Regarding your question about crafting loadouts before starting a run, it's generally a good idea to craft and test different combinations to see what works best for you. Since the bonus from mastery only applies to the specific item equipped, it might be worth experimenting with different weapons and shields to find the most effective combination.

As for the Mastery progression, it seems like the bonuses apply only to the specific item mastered, rather than being a hidden modifier that affects all items of the same type. This means you'll need to master each individual item separately if you want to take advantage of their unique perks.

Lastly, I noticed that you mentioned the 'Family Trials' mode in Dreamscaper, but later clarified that it's actually from another game called Children of Morta. Don't worry; we've all been there!

If none of these suggestions help resolve your issue, feel free to provide more details or ask further questions, and I'll do my best to assist you!

Dreamscaper instaling