Platybus
Gargantuan Aberration, Unaligned Armor Class 18 (natural armor) Hit Points 279 (18d20 + 90) Speed 50 ft., swim 100 ft.STR 23 (+6), DEX 12 (+1), CON 20 (+5), INT 8 (–1), WIS 15 (+2), CHA 9 (–1)
Skills Athletics +10, Survival +10 Senses darkvision 60 ft., tremorsense 120 ft., passive Perception 16 Languages understands Common and Deep Speech but can’t speak, only quacks Challenge 12 (8,400 XP) Proficiency Bonus +4
Amphibious. The platybus can breathe air and water. Bill Boarding. At the end of the platybus’s turn, it either opens or closes its bill until the start of its next turn. Creatures can freely enter or exit its body, as described in the Part Bus trait, only when the bill is open. Part Bus. The platybus’s body contains a rectangular space that is 20 feet long, 20 feet wide, and 10 feet high that can hold up to eight Medium creatures. There are eight seats in the form of organic, fur-covered benches, and the body has panels of thinner skin through which creatures can see as though they were foggy windows. Creatures inside the space have total cover against attacks and other effects outside the platybus. They can move freely within the space but can’t enter or exit it unless the platybus’s bill is open. Creatures can force the bill open for one round with a successful DC 18 Strength (Athletics) check and must repeat the check for each round they want to hold it open. If the platybus takes 25 damage or more on a single turn from a creature inside it, a window rips opens for one round during which creatures can exit by moving through it.
Actions
Multiattack. The platybus makes three attacks: two with its hind spurs and one with its tail swipe. Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 13 (3d4 + 6) bludgeoning damage. If the target is a Large or smaller creature, it must succeed on a DC 17 Dexterity saving throw or enter the space inside the platybus’s body described in Part Bus. Hind Spur. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 16 (3d6 + 6) piercing damage, and the target must make a DC 17 Constitution saving throw, taking 21 (6d6) poison damage on a failed save, or half as much damage on a successful one. Tail Swipe. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 13 (3d4 + 6) bludgeoning damage, and the target must succeed on a DC 17 Strength saving throw or be knocked prone.Legendary Actions
The platybus can take 1 legendary action, choosing from the options below. The legendary action can only be used at the end of another creature’s turn. The platybus regains spent legendary actions at the start of its turn. Move. The platybus moves up to its speed. Mutation (Recharge 5-6). All creatures inside the platybus, as described in the Part Bus trait, must succeed on a DC 15 Wisdom saving throw or experience a mutation. To determine the mutation, roll a d8 and use the result in the Mutations table. Each type of mutation, as distinguished by different entries in the table, is a separate curse for the purpose of undoing them, such as via the greater restoration spell. The platybus automatically uses Mutation if it goes 24 hours without using the ability.Mutations
| d8 | Mutation |
| 1 | One of your appendages changes into a tentacle or falls off if it’s already a tentacle. |
| 2 | You grow a beaver-like tail, or your tail grows 1 foot longer if you already have a tail. |
| 3 | Your mouth transforms into a foot-long duck bill or reverts to its original form if transformed. |
| 4 | You gain a level of exhaustion that can’t be removed when you’re inside the platybus. |
| 5 | You grow a pair of eyes in the back of your head or lose a pair of eyes if you already have two. |
| 6 | You grow a second mouth in your chest that continuously babbles in a random language. |
| 7 | Your skin glows a random color, shedding dim light in a 10-foot radius. |
| 8 | You lay a chicken egg at the end of every long rest. The number of eggs you lay increases by 1 if you already would lay one or more eggs. |
Platybus
Creature 11
Gargantuan, Aberration, Amphibious
Perception +21; darkvision, electrolocation 60 feet
Languages Aklo, Common; (can’t speak any language)
Skills Athletics +25, Survival +21, Transportation Lore +23
Str +8, Dex +3, Con +6, Int +4, Wis +6, Cha +4
Electrolocation A platybus can detect the location of creatures moving in water via the electricity created by their muscles contracting.
Part Bus The platybus’s body functions like a vehicle with a capacity for eight passengers and no pilot in a space that is 20 feet long, 20 feet wide, and 10 feet high. There are eight seats in the form of organic, fur-covered benches. Creatures can only enter or exit the platybus through its bill when it performs passenger service. Otherwise, they are trapped inside the space but can freely move within it. The body has panels of thinner skin through which creatures can see as though they were foggy windows. If the platybus takes piercing or slashing damage equaling or exceeding 25 from a single attack or spell by a passenger, a window rips opens for one round during which creatures can exit by moving through it. The platybus is off-guard to attacks by passengers.
AC 28; Fort +23, Ref +18, Will +21
HP 195
Mutation Passengers aboard the platybus after at least four consecutive turns without exiting must make a DC 27 Will save at the start of their turn.
- Critical Success The creature is immune to mutation for 48 hours.
- Success The creature is immune to mutation for 24 hours.
- Failure As success, but the creature experiences one of the following mutations (which are curse effects with counteract DC 27) chosen at random using 1d8 (1: one of the creature’s appendages changes into a tentacle or falls off if it’s already a tentacle; 2: the creature grows a beaver-like tail, or the tail grows 1 foot longer if the creature already has a tail; 3: the creature’s mouth transforms into a foot-long duck bill or reverts to its original form if it’s already mutated; 4: the creature becomes sickened 1 or increases their sickened value by 1 if already sickened; 5: the creature grows a pair of eyes in the back of their head or loses a pair of eyes if they already have two; 6: the creature grows a second mouth in their chest that continuously babbles in Aklo, or the mouth switches to a different random language if already present; 7: the creature’s skin glows a random color, casting bright light in a 15-foot radius; 8: the creature lays a chicken egg during their daily preparations or the number of eggs increases by 1 if the creature would already lay one or more eggs)
- Critical Failure As failure, but the creature is immune for 12 hours and experiences two different mutations, rerolling if they get a repeat result on the 1d8.
Passenger Service [free-action] Trigger A creature moves up to the platybus’s bill. Effect The platybus opens its bill, releasing any creature grabbed by its bill. The triggering creature can move aboard the platybus as a passenger or exit the platybus through the bill.
Speed 60 feet, swim 120 feet
Melee [one-action] bill +23, Damage 2d8+10 bludgeoning plus Improved Grab
Melee [one-action] leg spur +25 (poison), Damage 2d10+11 piercing plus 1d8 poison and platypus venom
Melee [one-action] tail +25 (finesse), Damage 2d8+11 bludgeoning plus Knockdown
Forced Boarding [one-action] Requirements The platybus has grabbed a creature with its bill and has capacity to add the creature as a passenger. Effect The platybus forcibly moves the creature into its body, making them a passenger.
Platypus Venom (poison) Saving Throw Fortitude DC 31; Maximum Duration 6 rounds; Stage 1 1d8 poison, 1d8 mental, and off-guard (1 round); Stage 2 2d10 mental, enfeebled 1, and off-guard (1 round); Stage 3 2d12 mental, enfeebled 2, and off-guard (1 round).
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