But it doesn't fit. You use tadpole powers. You dream the dream lover. She gives you greater tadpole powers. You use them. She returns in your dreams and increases your transformation. You are gaining more illilthid powers. She promises you the ability to rule at her side. All of it is illithid based.
True, by using the tadpole we also get the Dreamer. And yet the tadpole keeps trying to rip her apart from the very first dream sequence. And in the third dream we get to;
- Pass a Charisma check to resist both the Dreamer and the tadpole
- Put our trust in the Dreamer
- Give into the tadpole's rage and attack the Dreamer
One important thing to note is that we do get the first sign of ceremorphosis just before we meet the Dreamer. And then the next morning we are entirely cured and strong with new powers. Whoever the Dreamer might be is clearly powerful enough to harness the tadpole in our heads and give us powers while keeping the ceremorphosis at bay, which is why the tadpole wants to rip her apart so badly.
As for the weapon, the Githyanki box is just a magically sealed container for whatever is inside it because;
- Passing the Intelligence check makes our character sense something inside the box.
- Shadowheart keeps trying to open it all the time in the background and consistently fails
- Trying to get rid of it will make it electrify you so it shows signs of sentience and even intelligence
So whatever or whoever is inside the box strictly wants just us and nobody else, so it isn't implied that the weapon is of Githyanki origin, only the box is.
And an interesting thing Shadowheart mentions is that the voice told her she will be "
a beautiful weapon".
