Spoiler: Cornell, CR 2
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Cornell
Medium Humanoid (Elf), Neutral
Armor Class 13
Hit Points 55 (10d8+10)
Speed 30'
Strength Dexterity Constitution Intelligence Wisdom Charisma
8 (-1) 16 (+3) 12 (+1) 16 (+3) 10 (0) 8 (-1)
Skills Arcana +5, Religion +5
Senses Darkvision 60', Passive Perception 10
Languages Common, Elvish
Challenge 2
Spellcasting
Cornell is a mage with Intelligence as his casting stat. DC 13 and +5 to-hit. He typically prepares the following spells:

Cantrips (Cast as from a 5th level character): Frostbite, Chill Touch, Toll The Dead
1st Level (4 Slots): Charm Person, Cause Fear, Tasha's Hideous Laughter
2nd Level (3 Slots): Blur, Hold Person, Phantasmal Force
3rd Level (2 Slots): Fly, Lightning Bolt

Actions
Dagger Melee Weapon Attack:
+5 to-hit, reach 5', one target. Hit: 1d4+3 piercing damage.

Spoiler: Pebbles, CR 6
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Pebbles
Medium Humanoid (Dwarf), Neutral Evil
Armor Class 16 (Cthonic Power)
Hit Points 120 (16d8+48)
Speed 25'
Strength Dexterity Constitution Intelligence Wisdom Charisma
14 (+2) 8 (-1) 16(+3) 18 (+4) 8 (-1) 12 (+1)
Saving Throws Constitution +6
Damage Resistances Necrotic, Psychic, Poison
Senses Darkvision 120', Passive Perception 9
Languages Common, Dwarven, Gnomish, Infernal, Abyssal
Challenge 6
Devil's Sight
Pebbles can se through magical darkness with his Darkvision.

Cthonic Power
Imbued with eldritch strength, Pebbles' AC is set to 16, and he has resistance to several damage types, as noted in his statblock. He also adds his Intelligence modifier to his damage rolls with any spell.

Spellcasting
Pebbles is a mage who uses Intelligence as his casting stat. DC 15 and +7 to-hit. He knows the following spells:

Cantrips (Cast as from a 5th level character): Eldritch Blast, Chill Touch, Toll The Dead
1st Level: Armor Of Agathys, Hellish Rebuke, Hex
2nd Level: Darkness, Hold Person, Suggestion
3rd Level (3 Slots): Fear, Fly

Actions
Dagger Melee Weapon Attack:
+5 to-hit, reach 5', one target. Hit: 1d4+2 piercing damage.