In the Goblin Camp its said that the Absolute is a "she". You also run into 2 humans Bryn and her brother I believe and both of them mention that the Absolute is a "she" as well.
You learn its a she much earlier than that, Sazza tells you if you stop her execution in the Druid Grove.
Then if you have Lae'zel in the party, she very quickly realizes the Absolute is a trick of the tadpoles.
