Planar Bestiary
Portal dragons dwell on various planes, often near planar interstices or other unusual planar phenomena. They prefer to hunt unintelligent animals for food, but are not averse to eating intelligent creatures that defy or attack them. They are fascinated by the hidden structure of the multiverse and may briefly cooperate with others who share a similar love.
Massive metallic antlers crown an adult portal dragon's head. Their scales are iridescent and sometimes take on the predominant hues of the plane around them, though only approximately, never enough to be considered camouflage.
Portal dragons love to wander the interstices between planar locations and can be found near color pools, ethereal curtains, fey crossings, and similar locations.
Though individuals vary, portal dragons are typically selfish, and if one perceives that the best course of action would be to betray an ally or attack travelers who have an interesting planar artifact, that's what they probably do.
Motive: Exploration, discovering planar lore
Environment: Any planar location of interest
Health: 45
Damage Inflicted: Major wound (8 points)
Armor: 3
Movement: Short; long when flying
Modifications: Perception, magical knowledge, and planar knowledge as level 8; Speed defense as level 6 due to size
Combat: Portal dragons attack three times per round, using a combination of claws, bites, and antlers.
A portal dragon can breathe a cloud of tiny portals to other dimensions, filling an adjacent area a short distance in diameter. Creatures in the area take 7 points of damage (ignores Armor). Targets who succeed on a Speed defense task to avoid the full effect of these mouth-like portals still take 3 points of damage. The dragon can't use this breath in consecutive rounds.
A portal dragon can transport themself and up to eight human-sized willing creatures to another plane of the dragon's choice.
Interaction: Portal dragons have a range of personalities just like more common dragons, although they tend to be more curious and intellectual than brutish. If one encounters other travelers, they're likely to boldly quiz these people about where they've been and where they plan to go.
Use: The PCs see a portal dragon observing something they're interested in—is the dragon a rival, or potential ally? A portal dragon challenges the PCs to tests of knowledge, with a powerful secret as their stake in the game.
Loot: Portal dragons usually keep a well-hidden planar lair for their gold and jewels, and only bring a few magical cyphers (and perhaps an artifact) with them on their travels, such as an amulet of effort enhancer, a ring of force field, and artifact ring that grants the wearer 6 Armor against electricity for 10 minutes when activated (level 7; depletion: 1 in 1d10).
GM Intrusion: One of the portals from the dragon's breath momentarily expands to engulf a character. The character takes 5 points of damage (ignores Armor) and, on a failed Might defense task, is pulled into a random dimension. The character may return through the portal using their next action; otherwise, the portal dissipates.