Fleecemane Lion

Found at the far edge of the forests around Setessa, the fleecemanes are a breed of enormous lion, fully twice the size of a normal lion. These lions have shaggy, white manes that stretch to the ground, and their hides are a tanned bronze and almost as strong as the metal itself.
Thick-Skinned Attempting to hunt a fleecemane lion requires a great amount of stupidity, bravery, necessity, or some combination of the three. Even the greatest hunters of Setessa refuse to track the beast, believing the reward is rarely worth the difficulty of slaying one. If a fleecemane can be slain, however, and a tool found that is capable of piercing the body, there are few materials as useful for armor as a fleecemane hide.
In the past, hunting a fleecemane lion was considered a rite of passage for warriors that sought the honor of joining Nylea's elite guard of hunters. Nylea's priests claimed that slaying a fleecemane lion, and offering the hide to the god of the hunt, could draw her attention long enough to state your case. If you were rejected, Nylea would keep the hide for herself; but if Nylea accepted you into her ranks, she would transform the hide into armor to be worn into battle.
Lost Legacy Nylea's desire for the pelts of fleecemane lions is not born purely of the beauty of the hunt, but also out of a desire to see the beasts wiped from Theros. This is because the fleecemane lions are not natural creatures, but were not crafted from Nyx by the gods. In fact, fleecemane lions are a monster made by human hands, created by the citizens of the lost polis of Olantis.
When the gods turned against Olantis, punishing the people for their hubris, they struck down the city and set about wiping out any trace of its inhabitants. Nylea was placed in charge of destroying the unnatural creatures that had been created, and many of which had escaped when the city was razed. The fleecemane lions are one of the few creations of Olantis that remain, the powerful hides gifted to them by their creators serving to protect them from the wrath of the gods.

Fleecemane Lion

Found at the far edge of the forests around Setessa, the fleecemanes are a breed of enormous lion, fully twice the size of a normal lion. These lions have shaggy, white manes that stretch to the ground, and their hides are a tanned bronze and almost as strong as the metal itself.

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Armor Class	14 (natural armor)
Hit Points	10d12+50
Speed	50 ft.
Strength	17 (+3)
Dexterity	15 (+2)
Constitution	20 (+5)
Intelligence	3(-4)
Wisdom	12 (+1)
Charisma	8 (-1)
Skills	Perception d20+3	Stealth d20+6
Senses	Darkvision 60 ft.	Passive Perception 13
Languages	---
Challenge	4 (1,100 XP)
Special 1	Keen Smell	The fleecemane lion has an advantage on Wisdom	(Perception) checks that rely on smell
Special 2	Magic Weapons	The fleecemane lion's weapon attacks are magical
Special 3	Monstrosity	At the start of each of the fleecemane lion's turns,	if it took damage since the end of its last turn, roll a d10.
On a result of 5 or higher, the fleecemane lion	becomes monstrous until the end of its next long rest.	While monstrous the fleecemane lion gains a +1 bonus to	attack and damage rolls,
has an advantage on saving throws against spells and other magical abilities,	and is immune to damage from nonmagical sources.
Special 4	Pounce	If the fleecemane lion moves at least 20 feet straight	toward a creature and then hits it with a claw attack
on the same turn, that target must succeed on a	DC 13 Strength saving throw or be knocked prone
Special 5	Running Leap	With a 10-foot running start,	the lion can long jump up to 25 feet
Action 1	Multiattack	The fleecemane lion makes three attacks:	two with its claws and one with its bite
Action 2	Bite	Melee Weapon Attack	d20+5 to hit
Reach 5 ft.,one target	Hit 2d8+3 piercing damage
Action 3	Claw	Melee Weapon Attack	d20+5 to hit
Reach 5ft., one target	Hit 2d6+3 slashing damage