Consume Life. As a bonus action, the will-o'-wisp can target one creature it can see within 5 feet of it that has 0 hit points and is still alive. The target must succeed on a DC 10 Constitution saving throw against this magic or die. If the target dies, the will-o'-wisp regains 10 (3d6) hit points.
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.
It inflicts 5 (3d10) necrotic 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.
Shock. Melee Spell Attack: +8 to hit, reach 5 ft., one creature. Hit: 9 (4d8) lightning damage.
Invisibility. The will-o'-wisp and its light magically become invisible until it attacks or uses its Consume Life, or until its concentration ends (as if concentrating on a spell).
Three times per day, the creature can join with up to 5 others to form a greater being. All attacks are added and can be used against up to 6 targets, or on one target.
Once per day if two or more are combined inside a creature, they can create lightning that will chain to any of the creatures companions within 30 feet. 4D8 per hosted Monster.
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