Inviz stalker is from Elemental plane of air!
Or the stalker twins from the dnd cartoon, the phantom stalkers, from plane of fire/ from Fiend Folio: https://www.completecompendium.com/appendix/phanstal/
(((the 3.5e or Pathfinder 1e version - https://www.d20pfsrd.com/bestiary/monster-listings/outsiders/elemental/phantom-stalker/ )))
| Climate/Terrain: | Any |
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| Frequency: | Very Rare |
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| Organization: | Group |
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| Activity Cycle: | Any |
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| Diet: | Fire |
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| Intelligence: | Semi- (2-4) |
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| Treasure: | Nil |
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| Alignment: | Neutral |
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| No. Appearing: | 1-2 |
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| Armor Class: | 3 |
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| Movement: | 12, Fl 24 (D) |
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| Hit Dice: | 6 |
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| THAC0: | 15 |
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| No. of Attacks: | 2 |
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| Damage/Attack: | 1-8/1-8 |
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| Special Attacks: | See below |
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| Special Defenses: | Impervious to fire |
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| Magic Resistance: | Nil |
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| Size: | L (7'+) |
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| Morale: | Elite (16) |
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| XP Value: | 650 |
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- Phantom stalkers are creatures from the Elemental Plane of Fire, and are found on the Prime Material Plane only in the role of servants to high-level mages.
- In its raw elemental form, the phantom stalker appears as a slim pillar of fire with vague outlines of arms, legs, and a head, resembling an emaciated fire elemental. When on the Prime Material Plane, the creature's most common form is that of a muscular, reddish humanoid, 7' or more tall. with fiery eyes. Their faces are elongated versions of a human face, with a pointed chin and high forehead. When angered, they lose their solid form, appearing much as a burning ghost.
- However, phantom stalkers have the ability to polymorph self, and have been known to appear in various forms. Most of the forms they assume incorporate the colors red, yellow, and orange. Phantom stalkers can fly, and this ability is apparently unimpaired by the shape they assume.

Combat: Phantoms stalkers normally attack with their two sets of sharp claws, each of which can inflict 1-8 hit points of damage. If both sets hit, the stalker has a grip on the target and pulls the unfortunate victim to its fiery body, causing an additional 12 points of fire damage. The phantom stalker is able to cool its body to 70° Fahrenheit, so that it can lift or carry things without incinerating them. The creature has a Strength of 18/50.
Phantom stalkers are invulnerable to all sorts of fire attacks, and magical fire attacks (including fiery breath weapons) in fact heal the phantom stalkers one hit point for each Hit Die of fire attack. However, phantom stalkers save at -2 versus cold attacks, and such attacks add two points of extra damage per attack die.
If a phantom stalker is reduced to 10% or less of its original hit points, it can cast forth its dying life essence into a 6 HD fireball, after which it dematerializes and dies. The explosion is centered on the stalker itself. This is done only as a last resort, and is never done if it will harm the stalker's summoner - unless the summoner is directly and immediately responsible for the phantom stalker's demise. Those who would summon phantom stalkers would be wise not to give them hopelessly suicidal commands.
Habitat/Society: On the Elemental Plane of Fire, phantom stalkers have no true organization. In fact, they are often bullied around by fire elementals, efreet, and salamanders.
When a stalker is summoned by a mage, it is generally grateful for its departure from the Plane of Fire, and wishes to serve the mage loyally. Paradoxically, it is also instinctively resentful about being summoned, a trait common among many denizens of the Elemental Planes.
Phantom stalkers are summoned by a variant of the invisible stalker spell. The spell summoning the phantom stalker requires a piece of coal carved in the shape of a flame; otherwise, the spells are identical. A mage must exercise great caution in giving a phantom stalker instructions, since the stalker will try to pervert those instructions by taking the mage's words literally and following them to the letter. This is a nasty habit that phantom stalkers picked up from efreet. Aside from this little quirk, the summoned creature serves well as a bodyguard.
There is one explicit instruction inherent in their summoning. If the summoner is killed, his/her phantom stalker(s) will vanish into the Ethereal Plane, where it will spend 1-4 hours tracking down the killers. The stalker will unerringly find the killers, unless the latter are continually hidden by spells or other non-detection devices or abilities. Phantom stalkers gain this tracking ability only upon the death of their masters. The ability disappears once the summoner's slayer has been tracked, though it will return one more time if the slayer has escaped, giving the phantom stalker one last chance to find the killer.
After tracking down the summoner's killers, the phantom stalker will reappear on the Prime Material Plane, intent on vengeance.
Ecology: Besides being the whipping boys of the Elemental Plane of Fire, phantom stalkers are prized for the liquid fire that flows through their bodies. If this essence can be captured, it can be used to create Flame Tongue swords.
=====3.5e / PF1e stats below, most:
Phantom StalkerCR 4
XP 1,200
N Medium outsider (elemental, extraplanar, fire, shapechanger)
Init +6; Senses darkvision 60 ft.; Perception +12
DEFENSE
AC 17, touch 12, flat-footed 15 (+2 Dex, +5 natural)
hp 45 (6d10+12) (((I would probably give higher HP for 5e, way higher or better AC)))
Fort +7, Ref +7, Will +2
Defensive Abilities flames of healing; Immune fire, elemental traits
Weaknesses vulnerability to cold
OFFENSE
Speed 30 ft., fly 60 ft. (average)
Melee 2 burning claws +10 (1d4+4 plus 1d4 fire and grab)
Special Attacks burn, death throes
STATISTICS
Str 18, Dex 15, Con 14, Int 4, Wis 11, Cha 11
Base Atk +6; CMB +10 (+14 to grapple); CMD 22
Feats Improved Initiative, Power Attack, Skill Focus (Perception)
Skills Fly +11, Perception +12, Survival +9
Languages Common, Ignan
SQ find target, change shape 1/day (polymorph)
Burn (Ex)
Anyone touching (or touched by) (((I might say even ppl attacking with melee))) a phantom stalker must succeed on a DC 15 Reflex save or take an extra 1d6 points of fire damage as clothes ignite or armor becomes searing hot. The damage continues for another 1d4+4 rounds after the phantom stalker’s last successful attack. Phantom stalkers can also ignite flammable materials with a touch. The save DC is Constitution-based.
Death Throes (Ex)
A phantom stalker reduced to 0 hit points or less expels a fiery blast equivalent to a fireball (caster level 6th) that deals 6d6 points of fire damage (((maybe higher for 5e))) to all creatures within 20 feet. A DC 15 Reflex save reduces the damage by half. The save DC is Constitution-based. ~Avoids hurting it's summoner, unless pissed off.~
Flames of Healing (Ex)
Any magical attack against a phantom stalker that deals fire damage heals 1 point of damage for every 3 points of damage it would otherwise deal. If the amount of healing would cause the phantom stalker to exceed its full normal hit points, it gains any excess as temporary hit points.