Unstable Core. If the Unstable Wisp is reduced to zero or less hit points but is not reduced to negative twice its maximum health, it's Detonate ability triggers.
Ephemeral. The will-o'-wisp can't wear or carry anything.
Incorporeal Movement. The will-o'-wisp can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Variable Illumination. The will-o'-wisp sheds bright light in a 5- to 20-foot radius and dim light for an additional number of feet equal to the chosen radius. The will-o'-wisp can alter the radius as a bonus action.
Detonate. The Unstable Wisp Spirit self destructs, killing itself and compelling a DC 12 Dexterity Saving Throw to halve 2d4 necrotic damage to creatures within five feet.
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