This is likely only the first power we get from using the Tadpole. We might get more powers later as the game progresses, like the Source Powers we got in Divinity Original Sin 2, or the Bhaalspawn powers from the old BG games.
A major theme is using Psionic powers that help/complement the class so that should give us a hint of what to expect.
Here are some of my ideas.
Sorcerer: Float/Levitate spell
Bard: Mass suggestion
Barbarian: Incite fear/rage
Monk: Mental clarity
