Planescape Converting Planescape monsters

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Shade

Monster Junkie
Gronk
CLIMATE/TERRAIN: Any land
FREQUENCY: Uncommon
ORGANIZATION: Solitary or Herd (see below)
ACTIVITY CYCLE: Day
DIET: Unknown (see below)
INTELLIGENCE: Animal (1)
TREASURE: Nil
ALIGNMENT: Neutral
NO. APPEARING: 1 or 2-12 (see below)
ARMOR CLASS: 6
MOVEMENT: 12 (Charge 18)
HIT DICE: 4+2
THAC0: 17
NO. OF ATTACKS: 1
DAMAGE/ATTACK: 2-12
SPECIAL ATTACKS: Charge
SPECIAL DEFENSES: Half damage from blunt weapons, sound-based attacks
MAGIC RESISTANCE: Nil
SIZE: L (6’ tall)
MORALE: Fearless (19-20)
LEVEL/XP VALUE: 270

Huge, squat beasts with powerful legs and a thundering croak, the gronk are also known as “hopping rocks” or “stone frogs”. The ill-tempered beasts pose a threat to the nomadic bariaur tribes that roam the Outlands, and the bariaur tribes occasionally mount hunting parties solely to thin the gronk’s numbers.

According to bariaur nomads, gronk have existed on the Outlands for as far back as five bariaur generations. Their numbers have not increased substantially during that time, mostly due to bariaur thinning gronk herds with their rites of passage. A number of planewalkers have sighted the gronk on several Prime worlds as well.

Combat: The gronk aren’t subtle creatures. When a creature comes within their line of sight, they emit thundering croaks and hop toward the target and smash it to death with their spiked headplates. The gronk can perform a hopping-charge up to 180 feet, striking for 2-16 points of damage.

All gronk are nearly deaf. They gain a +4 bonus to saving throws vs. any sound-based attack or spell. (If the saving throw fails, they suffer only half damage from the attack.) Bright visual displays irritate gronk. Several wizards are known to cast dancing lights or pyrotechnics spells into gronk herds to drive them into a frenzy. This results in the herd turning on itself until nearly every member is dead.

Habitat/Society: The gronk are so ill-tempered they can’t even tolerate their own species. Despite their herd mentality, the strength of the herd depends on the gronk’s emotional cycle; members of a new herd can survive for almost a week before becoming irritated with one another. Soon after, their natural hatred gives way to furious bouts of head-smashing. The herd then dissolves and reforms into new herds several months later. As a result, the gronk can be encountered singly or in groups, depending on their “hate cycle.”

Gronk herds have been found in deserts, plains, mountains, and swamps in almost any climate. They shun any terrain near a large body of water, such as an ocean or lake.

Ecology: Ironically, the gronk’s hatred of each other propagates their species. The gronk’s reproductive organs are located near their brains, in the spiked carapace over their foreheads. The ridged spikes that cover the gronk’s brainplate are actually “buds.” When smashed together with sufficient force, the buds are transferred between carapaces, and a new bud grows on the headplate within a few days. This new ridge either falls off or is knocked off when the gronk smashes its forehead into another creature. If this ridge touches dirt, sand, earth, or rock, it submerges a few inches beneath the ground, only to burrow forth a few months later as a tiny gronk.

The gronk have never been seen to eat; it is a mystery how they sustain themselves. A gronk’s lifespan ranges from three to five years. As gronk age, their brainplates crack and flake off until the creature suffers brain failure and dies.

Gronk headplates are often sought after as shields and armor plating. Gronk shields provide a -1 bonus to AC against all crushing attacks (in addition to the normal shield bonus), but they weigh over 50 pounds. Characters with less than 15 Strength suffer a -1 penalty to all Dexterity checks and attack rolls when using the shields in combat.

Gronk headplates have also been used as a covering for siege towers and for shield walls. One bariaur myth claims gronk headplates were once placed upon an enchanted battering ram—this ram was said to act as a horn of blasting upon any structure, but it was so heavy it needed twice the number of men to carry it as a normal battering ram.

The gronk have bladderlike glands along their necks and upper backs. If skinned with care, a hunter can remove gronk glands intact. When treated with the right resins and filled with acid, the gland sacs can be used as grenades. These bladder bombs are extremely effective against fiends, and Blood War patrols occasionally capture herds of gronk, keeping them in pens in the Lower Planes to be harvested for their glands.

Originally appeared in Dragon Magazine #262 (1999).
 

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freyar

Extradimensional Explorer
Ok, some similar critter stats:

Bulette (H, 9HD) Str 27, Dex 15, Con 20, Int 2, Wis 13, Cha 6
Ethereal Marauder (M, 2HD) Str 14, Dex 12, Con 11, Int 7, Wis 12, Cha 10
Hippogriff (L, 3HD) Str 18, Dex 15, Con 16, Int 2, Wis 13, Cha 8
Owlbear (L, 5HD) Str 21, Dex 12, Con 21, Int 2, Wis 12, Cha 10
Pegasus (L, 4HD) Str 18, Dex 15, Con 16, Int 10, Wis 13, Cha 13

I'm thinking Hippogriff-Pegasus range for physical stats, but anywhere in here, really. These have Large size bulette written on them, too.
 

Shade

Monster Junkie
Str 23, Dex 15, Con 20, Int 2, Wis 12, Cha 7?

That's essentially an ape with slightly higher Str and Con.
 

freyar

Extradimensional Explorer
Sure. Are these things bipedal or quadrupedal? Now that you mention an ape, I went back and looked and can't tell. Is there a picture for these (Echohawk?)?
 

Shade

Monster Junkie
Sure. Are these things bipedal or quadrupedal? Now that you mention an ape, I went back and looked and can't tell. Is there a picture for these (Echohawk?)?

There is. I'll see if I can upload it.

As as aside, this creature (and the others from that issue), were all from the Planescape: Torment videogame.

Edit: Ironically, the Torment Creature Guide lists all their ability scores as 9!

Another edit: Here's some fan art.

Yet Another Edit: Here's an animated gif of a gronk running.
 
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Shade

Monster Junkie
Added to Homebrews.

MOVEMENT: 12 (Charge 18)

Another take on sprint?

Combat: The gronk aren’t subtle creatures. When a creature comes within their line of sight, they emit thundering croaks and hop toward the target and smash it to death with their spiked headplates. The gronk can perform a hopping-charge up to 180 feet, striking for 2-16 points of damage.

Massive racial bonus on Jump checks, or a special leap attack? I'm leaning toward the latter.

All gronk are nearly deaf. They gain a +4 bonus to saving throws vs. any sound-based attack or spell. (If the saving throw fails, they suffer only half damage from the attack.)

There's this precedent...

Deaf (Ex): A steel predator is completely incapable of perceiving sound, and is thus immune to language-dependent effects and sonic effects dependent on hearing. The creature has adapted to this limitation and thus suffers no penalty on initiative checks because of its deafness.

Bright visual displays irritate gronk. Several wizards are known to cast dancing lights or pyrotechnics spells into gronk herds to drive them into a frenzy. This results in the herd turning on itself until nearly every member is dead.

Flavor text, or actual rage/frenzy mechanic triggered by light effects?
 

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