Oo-er is New Guinea’s mythical square-egg bird, a toxic mountain guardian of fate and imunu, now with full 5E lore and stat block. Oo-er dnd 5e demon for fernflower press fern flower press fernflowerpress.com - new guinea square-egg magical bird custom stat block for 5E mountain forest encounters. dnd, monster, creature, beast, 5e, bestiary, by cr, homebrew, tome, guide, lore, stat blocks, tools, modules, legend, folklore

Oo-er

A magical bird that lays square eggs
Type: beast Habitat: mountain forests and volcanic slopes Region: New Guinea

Lore

Oo-er is a mythical bird said to live in the mountain forests of New Guinea. Local lore calls it the only bird on Earth that lays perfectly cubic eggs—artifacts charged with imunu, an inner spiritual force able to steer fate itself. The bird, in turn, is seen as the living fusion of perilous magic and the island’s raw wilderness.

In appearance Oo-er is a sturdy, medium-sized bird marked by a striking contrast of black and deep russet plumage. The colors double as a warning: every feather is saturated with batrachotoxin, the same fierce neurotoxin found in real New Guinean pitohui. A single unprotected touch brings rapid numbness and intense pain. Its legs resemble those of a megapode—broad, muscular, tipped with long claws.

Oo-er builds its nest inside a large mound, often on the flank of an active or dormant volcano. In the grass-lined bowl usually lie four cubic eggs whose pipped faces look like dice, earning them the nickname “bones of fate.” While the female forages, she leaves in the nest a large lapa wing feather, soaked with both toxin and imunu. The feather signals her mate that she will soon return; folklore treats it as a temporary magical enclave able to summon the bird instantly or project an illusion of her presence.

Ecologically, Oo-er favors elevations up to two thousand meters, where wet tropical forest meets the warmth of fumaroles and hot soil patches. Its diet is fruit, seeds, and invertebrates rich in alkaloids, which keep its toxin supply topped up. The bird leads a crepuscular life: shy by day, active at night, and regularly patrolling its territory. Territoriality runs high; any approach to a mound during incubation triggers an immediate, often self-sacrificing attack by both adults.

Cognitively, Oo-er shows complex though not fully human-like behavior. The birds rely on passive toxicity as a primary shield, and in a fight they strike once with the beak and withdraw, letting venom do the work. If an enemy is protected against the toxin, Oo-er stays in constant motion, using dense foliage for cover.

Stat block

Oo-er

Medium beast, unaligned

Armor Class 16 (natural armor, agile plumage)
Initiative +4
Hit Points 110 (13d8 + 39)
Speed 20 ft., fly 80 ft.

MOD
SAVE
str
12
+1
+1
int
5
-3
-3
MOD
SAVE
dex
18
+4
+7
wis
14
+2
+2
MOD
SAVE
con
16
+3
+6
cha
10
+0
+0

Saving Throws Dex +7, Con +6
Skills Perception +5, Stealth +7 (forest only), Survival +5
Damage Resistances poison; bludgeoning, piercing, and slashing from non-magical ranged attacks
Condition Immunities poisoned
Senses darkvision 60 ft., passive Perception 15
Languages -
CR 6 (2,300 XP) Proficiency Bonus +3
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Find this creature’s full lore and stat block in the book