Chronostep

When you cast this spell, you move up to half your movement speed and regain any hit points you lost since the end of your previous turn. This movement does not provoke attacks of opportunity.

If you cast this spell after casting it your previous turn, roll percentile dice. On a roll of 40 or lower, the health that would be regained by this casting is instead lost, and your hit point maximum is reduced by an equal amount. This effect is removed after a long rest.

At Higher Levels. If you cast this spell using a spell slot of 7th level or higher, the percentile dice roll that would cause you to lose hit points decreases by 10 for each slot above 6th.