The action is to "gain 6 wrath intent if you perform an Assault action against an Entity standing in a shining gem space". My question is who needs to be standing on the shining gem space? The entity, the Dreamer or either?
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The Entity has to stand in space with the Entrance (the blue portal) icon. Keep in mind that it's not a Shining Gem space but the starting "spawn" for Dreamers.
Just the entity needs to be in a starting location. (A shining gem space is just an outline of a gem.)