Onix / Steelix
Onix is composed of a giant chain of gray boulders that become smaller towards the tail. It has black eyes and a rounded snout. On top of its head is a rocky spine. As it grows older, it becomes more rounded and smoother, eventually becoming similar to black diamonds. Inside its brain is a magnet that serves as an internal compass, guiding Onix wherever they need to go and prevents them from getting lost while digging.
Onix tunnels under the ground at over 50 miles (80 kilometers) per hour, which causes tremors and a terrifying roar that echoes a long way. Hard objects encountered while tunneling are absorbed into its body, which makes it very sturdy. It also consumes the boulders for food. The massive, winding tunnels it leaves behind are used as homes by Diglett. Onix is capable of rotating its head, or any part of its body, in a full 360 degrees. It is very aggressive that will constantly attack humans and other creatures when in pain. It is said that an Onix that lives for about 100 years will grow into a Steelix after its composition becomes more diamond-like. It can be found in mountains and caves.
Crystal Onix
Elemental legends describe a revered and mythical Onix whos body isn't made of dull rock, but resplendent crystal. If such an Onix exists, the mineral that armors it would likely be similar to adamantine. A "Crystal Onix", as the legends call it, would theoretically have the same statistics as a regular Onix, but any critical hit against it would become a normal hit that is, according to the legends.
Steelix is long, serpentine with a silvery-gray body made up of rock-like sections, which can possess chips and scrapes from fights and tunneling. Three of those sections have long rock spikes coming out of them on either side. It has a massive head mainly made up of its large, wide jaw with sets of large square teeth inside. Along its bottom jaw are ridges: there are two pairs of ridges on a male Steelix, while there is only one pair on a female. Several small, square lumps cover the underside of its lower jaw. Its eye sockets are slightly deep-set, and the eyes themselves are red. Its head has two long ridges going from the eyes up to the top of its head. The tip of its tail is conical with a blunt tip.
Onix
As it digs through the ground, it absorbs many hard objects. This is what makes its body so solid.
| Armor Class | 18 (natural armor) | ||
|---|---|---|---|
| Hit Points | 16d12+64 | ||
| Speed | 40 ft. | Burrow 60 ft. | |
| Strength | 24 (+7) | ||
| Dexterity | 12 (+1) | ||
| Constitution | 24 (+7) | ||
| Intelligence | 3 (-4) | ||
| Wisdom | 11 (+0) | ||
| Charisma | 10 (+0) | ||
| Saving Throws | Dexterity d20+5 | Constitution d20+12 | |
| Damage Resistances | Bludgeoning | Piercing | Slashing from non magical weapons |
| Acid | Cold | Fire | |
| Damage Immunities | Lightning | Poisoned | |
| Damage Vulnerabilities | Cold | ||
| Condition Immunities | Poisoned | ||
| Senses | Darkvision 60 ft. | Tremorsense 120 ft. | Passive Perception 10 |
| Languages | Terrain | ||
| Challenge | 13 (10,000 XP) | ||
| Special 1 | Rock Head | When the Onix takes damage, | it can use its reaction to reduce |
| the damage by 1d12+7 | |||
| Special 2 | Tunneler | The Onix can burrow through solid rock | at half its burrow speed and leaves |
| a 10-foot-diameter tunnel in its wake | |||
| Action 1 | Multiattack | The Onix makes two melee attacks | |
| Action 2 | Tackle | Melee Weapon Attack | d20+8 to hit |
| Reach 15 ft., one target | Hit 3d10+6 bludgeoning damage | and target is grappled (escape DC 17) | |
| Action 3 | Constrict | One grappled target must make | a DC 17 Strength saving throw or |
| take 1d10+6 bludgeoning damage on a failed save, | or half as much damage on a successful one. | This attack can be used as a bonus action | |
| Action 4 | Bind | Melee Weapon Attack | d20+12 to hit |
| Reach 5 ft., one target | Hit 4d10+7 bludgeoning damage. | If the target is a creature, | it is grappled (escape DC 20). Until this grapple ends, |
| the target is restrained and the | Onix cannot bind another target | ||
| Action 5 | Slam | Melee Weapon Attack | d20+12 to hit |
| Reach 15 ft., one target | Hit 3d12+7 bludgeoning damage | and if the target is a creature, | it must succeed on a |
| DC 20 Strength saving throw or be knocked prone | |||
| Action 6 | Stealth Rock (3/day) | The Onix sheds pointed shards of its rocky body over | the ground in a 30-foot-radius centered on itself. |
| Each creature in that area must make | a DC 20 Dexterity saving throw, | taking 4d10 piercing damage | on a failed save or half as much |
| damage on a successful one. | Any creature that enters the area or | moves through it on its turn must succeed on | a DC 15 Dexterity saving throw or |
| stop moving and take 1 piercing damage. | Until the creature regains at least 1 hit point, | its walking speed is reduced by 10 feet. | A creature moving through the area at half speed |
| doesn't need to make the saving throw | |||
| Action 7 | Rock Throw | Ranged Weapon Attack | d20+5 to hit |
| Range 60/80 ft., one target | Hit 6d6 bludgeoning damage |
Steelix
It is said that if an Onix lives for over 100 years, its composition changes to become diamond-like.
| Armor Class | 51 (natural armor) | ||
|---|---|---|---|
| Hit Points | 24d8+192 | ||
| Speed | 110 ft. | Burrow 110 ft. | |
| Strength | 41 (+21) | ||
| Dexterity | 12 (+1) | ||
| Constitution | 27 (+8) | ||
| Intelligence | 8 (-1) | ||
| Wisdom | 11 (+0) | ||
| Charisma | 12 (+1) | ||
| Saving Throws | Dexterity d20+20 | Constitution d20+22 | |
| Skills | Listen d20+27 | ||
| Damage Resistances | Bludgeoning | Piercing | Slashing from non magical weapons |
| Acid | Cold | Fire | |
| Damage Immunities | Lightning | Poisoned | |
| Damage Vulnerabilities | Cold | ||
| Condition Immunities | Poisoned | ||
| Senses | Darkvision 60 ft. | Tremorsense 120 ft. | Passive Perception 10 |
| Languages | Terrain | ||
| Challenge | 20 (100,000 XP) | ||
| Special 1 | Rock Head | When the Onix takes damage, | it can use its reaction to reduce the |
| damage by 2d12+7 | |||
| Special 2 | Tunneler | The Onix can burrow through solid rock | at half its burrow speed and leaves |
| a 10-foot-diameter tunnel in its wake | |||
| Action 1 | Multiattack | The Onix makes two melee attacks | |
| Action 2 | Tackle | Melee Weapon Attack | d20+21 to hit |
| Reach 15 ft., one target | Hit 6d10+6 bludgeoning damage | and target is grappled (escape DC 17) | |
| Action 3 | Constrict | One grappled target must make | a DC 24 Strength saving throw or take 2d10+12 bludgeoning damage |
| on a failed save, or half as much damage on a successful one.v This attack can be used as a bonus action | |||
| Action 4 | Bind | Melee Weapon Attack | d20+21 to hit |
| Reach 5 ft., one target | Hit 8d10+12 bludgeoning damage. | If the target is a creature, it is grappled (escape DC 25). | Until this grapple ends, the target is restrained |
| and the Onix cannot bind another target | |||
| Action 5 | Slam | Melee Weapon Attack | d20+15 to hit |
| Reach 15 ft., one target | Hit 6d12+12 bludgeoning damage | and if the target is a creature, | it must succeed on a DC 25 Strength |
| saving throw or be knocked prone | |||
| Action 6 | Stealth Rock (3/day) | The Onix sheds pointed shards of its rocky body over the ground | in a 30-foot-radius centered on itself. |
| Each creature in that area must make | a DC 25 Dexterity saving throw, | taking 8d10 piercing damage on | a failed save or half as much damage on a successful one. |
| Any creature that enters the area or moves through it | on its turn must succeed on | a DC 20 Dexterity saving throw | or stop moving and take 1 piercing damage. |
| Until the creature regains at least 1 hit point, | its walking speed is reduced by 10 feet. | A creature moving through the area at half | speed doesn't need to make the saving throw |
| Action 7 | Rock Throw | Ranged Weapon Attack | d20+12 to hit |
| Range 60/80 ft., one target | Hit 12d6 bludgeoning damage |
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