Cofilli Heatsink

Death Burst. When Cofilli dies, she turns in to stone and explodes in a burst of rock shards becoming a smoking pile of rubble. Each creature within 30 feet of Cofilli when she explodes must succeed on a DC 19 Dexterity saving throw or 33 (6d10) bludgeoning damage, half on a successful save.

Earth Walk. Cofilli can move across difficult terrain made of earth or stone without expending extra movement.

Merge with Stone. Cofilli can cast pass without trace, requiring no material components, once per day. She regains this ability after a short rest. Constitution is the spellcasting ability for this spell.

Special Equipment (Greatsword of Wounding). Once per turn, when Cofilli hits a creature with an attack using this weapon, she can wound the target. At the start of each of the wounded creature's turns, it takes 3d4 necrotic damage for each time she's wounded it, and it can them make a DC 15 Constitution saving throw, ending the effect of all such wounds on itself on a success. Alternatively, the wounded creature, or a creature within 5 feet of it, can use an action to make a DC 15 Wisdom (Medicine) check, ending the effect of such wounds on it on a success.

Spellcasting. Cofilli is a 7th-level spellcaster. Her spellcasting ability is Charisma (spell save DC 13, +5 to hit with spell attacks). She knows the following sorcerer spells (an asterisked spell is from appendix B):

Cantrips (at will): acid splash, blade ward, light, mending, mold earth*

1st level (4 slots): expeditious retreat, false life, shield

2nd level (3 slots): Maximilian’s earthen grasp,* shatter

3rd level (3 slots): erupting earth,* meld into stone

4th level (1 slot): stoneskin

Greatsword of Wounding. Melee Weapon Attack: Attack: +15 to hit, reach 5 ft., one target. Hit: 27 (6d6+6) slashing damage. Cofilli can also expend a spell slot to deal extra damage, dealing 6d8 slashing damage for a 1st level slot, plus an extra additional 3d8 for every level of the slot above first