Config to change the spirals on eldritch mobs to highlights

Was wondering if it was possible make a config for instead of having spirals to indicate a mob is eldritch it glows or has a special type of border similar to the spectral effect except the color matches the type of eldritch. Maybe also allowing the player to configure each color depending on the tier.

The issue does not identify any files, tests, or entry points. First locate the code that renders eldritch mob spirals and determine how mob tiers and visual effects are represented; done would include configurable indicators and per-tier colors if the requested design is accepted.

Written by the indexing model from the issue text.