Mood Stones

Crafted with an Amethyst Shard and a Ghast Tear. They might also occasionally be found in Churches, Igloos, Outposts, and Woodland Mansions, while also serving as a Journeyman-level Cleric trade.

By holding the Mood Stone and fixing their cursor over a Mob, the Player could assess the attitude of the Mob towards them.

This could be used to assess:

1. Their standing in a Village, with many shades to indicate a deteriorating or improving relationship.

2. Whether a Neutral Mob is provoked without getting close enough to be in danger.

3. Whether a Mob trusts them (as featured in Foxes and Ocelots).

4. Whether a Mob the player hasn't discovered before is hostile.

I could describe the colors and shades as they pertain to the above, but the specifics are probably best decided through testing of the concept.