A Planeswalker spark is a latent power inborn into a very small number of sentient creatures across the Multiverse, which if activated permanently turns the bearer into a planeswalker. A planeswalker is granted the ability to travel between the planes of the Multiverse.
You may cast Plane Shift as a ritual, at a casting time of one minute, to take you to a plane you have been in. Alternatively, you can travel to an unknown plane if you have touched a creature or object who was born or created on that plane. The portal can only be opened five times per long rest, and you may only take yourself and your belongings with you.
Furthermore, if you drop to 0 hit points you can make a Charisma or Wisdom saving throw with a DC equal to the damage taken. On a successful save, you instead takes no damage and Plane Shifts away.
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