Werebear

Medium humanoid (human, shapechanger), neutral good

Armor Class 10 in humanoid form, 11 (natural armor) in bear and hybrid form
Hit Points 135 (18d8 + 54)
Speed 30 ft. (40 ft., climb 30 ft. in bear or hybrid form)

STR	DEX	CON	INT	WIS	CHA
19 (+4)	10 (+0)	17 (+3)	11 (+0)	12 (+1)	12 (+1)

Skills Perception +7
Damage Immunities bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons
Senses passive Perception 17
Languages Common (can’t speak in bear form)
Challenge 5 (1,800 XP)

Shapechanger. The werebear can use its action to polymorph into a Large bear-humanoid hybrid or into a Large bear, or back into its true form, which is humanoid. Its statistics, other than its size and AC, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.
Keen Smell. The werebear has advantage on Wisdom (Perception) checks that rely on smell.

Actions

Multiattack. In bear form, the werebear makes two claw attacks. In humanoid form, it makes two greataxe attacks. In hybrid form, it can attack like a bear or a humanoid.
Bite (Bear or Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) piercing damage. If the target is a humanoid, it must succeed on a DC 14 Constitution saving throw or be cursed with werebear lycanthropy.
Claw (Bear or Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.
Greataxe (Humanoid or Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 10 (1d12 + 4) slashing damage.

Troll

Large giant, chaotic evil

Armor Class 15 (natural armor)
Hit Points 84 (8d10 + 40)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
18 (+4)	13 (+1)	20 (+5)	7 (-2)	9 (-1)	7 (-2)

Skills Perception +2
Senses darkvision 60 ft., passive Perception 12
Languages Giant
Challenge 5 (1,800 XP)

Keen Smell. The troll has advantage on Wisdom (Perception) checks that rely on smell.
Regeneration. The troll regains 10 hit points at the start of its turn. If the troll takes acid or fire damage, this trait doesn’t function at the start of the troll’s next turn. The troll dies only if it starts its turn with 0 hit points and doesn’t regenerate.

Actions

Multiattack. The troll makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.
Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Mammoth

Huge beast, unaligned

Armor Class 13 (natural armor)
Hit Points 126 (11d12 + 55)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
24 (+7)	9 (−1)	21 (+5)	3 (−4)	11 (+0)	6 (−2)

Senses passive Perception 10
Languages —
Challenge 6 (2,300 XP)

Trampling Charge. If the mammoth moves at least 20 feet straight toward a creature and then hits it with a gore attack on the same turn, that target must succeed on a DC 18 Strength saving throw or be knocked prone. If the target is prone, the mammoth can make one stomp attack against it as a bonus action.

Actions

Gore. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 25 (4d8 + 7) piercing damage.
Stomp. Melee Weapon Attack: +10 to hit, reach 5 ft., one prone creature. Hit: 29 (4d10 + 7) bludgeoning damage.

Description

A mammoth is an elephantine creature with thick fur and long tusks. Stockier and fiercer than normal elephants, mammoths inhabit a wide range of climes, from subarctic to subtropical.

Frost Giant

Huge giant, neutral evil

Armor Class 15 (patchwork armor)
Hit Points 138 (12d12 + 60)
Speed 40 ft.

STR	DEX	CON	INT	WIS	CHA
23 (+6)	9 (−1)	21 (+5)	9 (−1)	10 (+0)	12 (+1)

Saving Throws Con +8, Wis +3, Cha +4
Skills Athletics +9, Perception +3
Damage Immunities cold
Senses passive Perception 13
Languages Giant
Challenge 8 (3,900 XP)

Actions

Multiattack. The giant makes two greataxe attacks.
Greataxe. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 25 (3d12 + 6) slashing damage.
Rock. Ranged Weapon Attack: +9 to hit, range 60/240 ft., one target. Hit: 28 (4d10 + 6) bludgeoning damage.