Alchemy.Guild.highest_role

You're seeing just the function highest_role, go back to Alchemy.Guild module for more information.
Link to this function

highest_role(guild, member)

Specs

highest_role(t(), member()) :: role()

Finds the highest ranked role of a member in a guild.

This is useful, because the permissions and color of the highest role are the ones that apply to that member.