Armor Class 12
Hit Points 40 (9d8)
Speed 30 ft.
Saving Throws INT +6, WIS +4
Skills Arcana +6, History +6
Senses passive Perception 11
Languages any four languages
Challenge 5
Transmuter's Stone. The transmuter carries a magic stone it crafted that grants its bearer one of the following effects: Darkvision out to a range of 60 feet An extra 10 feet of speed while the bearer is unencumbered Proficiency with Constitution saving throws Resistance to acid, cold, fire, lightning, or thunder damage (transmuter's choice whenever the transmuter chooses this benefit) If the transmuter has the stone and casts a transmutation spell of 1st level or higher, it can change the effect of the stone.
Quarterstaff. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 2 (1d6 - 1) bludgeoning damage, or 3 (1d8 - 1) bludgeoning damage if used with two hands.
Volo's Guide to Monsters, p. 218