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[Infinite Dungeons] Shields suppress unarmed strikers' Flame Weapon
If a creature companion whose Main Weapon is Unarmed equips a shield, the Flame Weapon
spell won't work for it. Unequipping the shield fixes the issue and enables the spell to work.
Please note that, normally, creature companions are not able to equip shields because they don't have the Shield Proficiency feat. But when they equips equipments which grants the Shield Proficiency feat, they are then able to equip shields. That's how my creature companions were able to equip shields.