Akmenos from Nowhere 
Medium humanoid (Tiefling), CG
Armor Class. 12 (+2 DEX) 
Hit Points. 12 
Speed. 30ft (3mph, 24mpd)
STR 8(-1) | DEX 14(+2) | CON 13(+1) | INT 16(+3) | WIS 10(+0) | CHA 14(+2)
Saving Throws. Intelligence +5, Wisdom +2 
Skills. Arcana +5, Deception +4, Investigation +5, Stealth +4 
Senses. Darkvision 60ft, passive Perception 10 
Languages. Common, Infernal
Hellish Resistance. Akmenos has resistance to fire damage.
Infernal Legacy. Akmenos knows the thaumaturgy cantrip.
Cantrips. Akmenos knows 3 wizard cantrips. 
Known Cantrips: fire bolt, minor illusion, poison spray, thaumaturgy
Spellcasting. Akmenos can prepare 5 arcane spells from his spellbook after a long rest. The DC of spells he casts is 13 and his spell attack bonus is +5. Akmenos can cast spells from his spellbook without preparing them as a ritual if it has teh ritual tag. 
Prepared: Detect Magic*, Grease, Silent Image, Mage Armor, Witch Bolt 
1st level slots: 3
Spellbook. Akmenos' spellbook contains 6 spells: Charm Person, Detect Magic*, Earth Tremor, Find Familiar*, Grease, Mage Armor, Silent Image, Witch Bolt. 
*Denotes a ritual spell.
Arcane Recovery. Akmenos can recover 1 level of spell slots once per day after a short rest.
Transmutation Savant. Akmenos can scribe a transmutation spell into his spellbook in half the time and gold cost it would normally take.
Minor Alchemy. Akmenos can perform a special alchemical procedure on one object made of wood, stone, iron, copper, or silver and change it into another one of those materials. For each 10 minutes spent performing the procedure he can transform 1 cubic foot of material. After 1 hour, or until he loses concentration, the material reverts back to its original substance.
Actions 
Dagger. Melee or Ranged Weapon Attack: +4 to hit, reach 5ft, or range 20/60ft, one target. Hit: 1d4+2 piercing damage.