Alchemy.Events.on_role_create

You're seeing just the macro on_role_create, go back to Alchemy.Events module for more information.
Link to this macro

on_role_create(func)

(macro)

Registers a handle triggering whenever a role gets created in a guild.

args : Alchemy.Guild.role, snowflake

Receives the new role, as well as the id of the guild that it belongs to.