Most seem straight forward but two are causing me pause.  Can you offer any insight into your thinking:

Selenite Crystal, adv. Meditation, three uses - Advantage on meditation ... What game mechanic does meditation impact?

Elven Leven Bread, last 4 days ... what is lasting 4 days? ... the bread lasts 4 days (seems underwhelming and costly) or you are satiated for 4 days?

Thanks

I do have some doubts as well regarding "Moondust, pouch, treat as invisible spell".

How many time it can be used?

Hey both, feedback as follows:

• Selenite Crystal; Wildfolk can use the meditation ability which allows them to recover d4 health. The use of a faintly magical selenite crystal gives them advantage on this roll but the power fades (hence limited uses)
• Elven Leven Bread; 1 portion (i.e. 1 equipment slot) lasts 4 days. Due to the minimal weight and elven nature the cost is higher
• Moondust; this is a one use item

Anything magical is costly and expensive as my theme was a 'low magic' setting. Obviously feel free to interpret and use the rules the way you want of course and these questions are good feedback on things which may need balancing or tweaking in the future.