Call Shadows is sustain. When you respecing or assigning points after level up then all sustains are disabled/enabled in background.
When Call Shadows is disabled/enabled in after respecing then all shadows will disappear in next turn.
I don't know if this is a bug or WAD but it is really annoying and prevents you to use Doomed with some tactics. If you are low on hate it may prevent you from leveling up until hate is restored.
[1.1.3] respecing Doomed will casue shadows to disapear
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