Arrow of wonder

• Choose one target within range. The arrow automatically hits; the target makes a saving throw determined by the chosen effect. On a successful save the target either suffers half the damage (for damage effects) or suffers no additional effect and resists non-damaging effects as noted below.
• You may change the chosen effect each time you cast the cantrip.
• Only one effect applies per casting.
• If an effect requires concentration, casting another concentration spell ends the Arrow of Wonder’s concentration as normal.
• The spell’s power scales with your level for the Damage and Stun effects (see Scaling).

Effects

Choose one effect when you cast.

• Stun
• Effect: The target must succeed on a Constitution saving throw or be stunned until the end of its next turn. On a successful save the target is not stunned.
• Damage: The arrow deals 1d4 thunder damage on a hit (half on a successful save). See Scaling for damage increases.
• Concentration: No.
• Sleep
• Effect: The target must succeed on a Wisdom saving throw or fall unconscious for 1 round (the target wakes if it takes damage). On a successful save the target is not affected.
• Concentration: No.
• Convert
• Effect: The target must succeed on a Wisdom saving throw or be charmed by you for up to 1 minute. While charmed in this way, the target views you as a trusted ally and will not intentionally harm you. The charm ends early if you or your companions attack the target, if you use a hostile action against it, or if you cast a spell that forces it to make a saving throw. On a successful save the target is not charmed.
• Limitations: This effect cannot force extraordinarily strong loyalties (such as making a creature act directly against its deeply held alignment or instincts) and is subject to DM adjudication.
• Concentration: Yes.
• Transmute

• Effect: The target must succeed on a Wisdom saving throw or be transformed into a nonhostile beast chosen by you that has a challenge rating equal to the target’s CR, or 1 step higher or lower (for creatures without a formal CR, the DM uses an appropriate approximation). The transformed creature uses the beast’s stats but retains its alignment and mental ability scores; it is not considered friendly merely by being a beast. The transformation lasts for up to 1 minute or until the target drops to 0 hit points, whichever comes first.
• Limitations: This effect cannot transform a target into a creature that would be obviously inappropriate for its size (as determined by the DM), cannot create a form with legendary actions or lair actions, and cannot affect creatures immune to polymorph- or shape change-like effects.
• On a successful save the target is not transformed.
• Concentration: Yes.

At higher levels (5,11,17) you can create an extra effect.