My previous post assumed that you had perhaps modified visuals.txt and that was causing crashes during startup. Simply adding a kind of monster with ATTR_FLICKER would not affect the tables for color cycling or flickering. If you could post the entry for the Blue Faerie from monster.txt and its relevant base from monster_base.txt that could help diagnose what is going wrong when trying to look up its color. The only relevant attribute for flickering is the base color, and ui-visuals.c checks that is in bounds for the flicker tables.
As for what would be the closest match to ATTR_METAL, I do not know and would need to look at the Sangband or Unangband source to see what they did.
As for what would be the closest match to ATTR_METAL, I do not know and would need to look at the Sangband or Unangband source to see what they did.
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