The 1D100 table below the picture has, yet again, been shamelessly stolen from Jack Mcnamee's terrific blog, and slightly adapted to Second Age Pamaltela by yours truly.
Hornilio is described on the glorantha.com web-site as "a complex concatenation of salt marshes, swamps, bogs, and mud flats, inhabited by goblins and monsters. The land is less often visited than even the wastes of Porlaso across the sea, mainly because the goblins of Hornilio seem to be organised.
Here are only marshland and swamps, so low and level that tides wash far inland and the rivers flood far to the sea. Huge monsters from earlier ages inhabit this place."
Why would any delver want to go there? Who knows! But in case they should, you as the GM are ready to make their life miserable!
Horrible insects, leeches, bog water — a gross, clinging place that you just want to get out of as soon as possible.
–5 to all skill checks without something to get rid of the constant insects.
1-2: Reed eels. 3D6 Sentient reeds with bulbous suckers at head. Wait for animal to wade into them, then latch of from all sides and drain it of blood.
3-4: 2D4 Ooze fish: Massive, heavy fish attach themselves onto feet of wading party, use weight to drag them down to depths/under mud. Can be removed instantly by plunging sharp object into special spot beneath their blowhole.
5-6: Halitoad (large frog-like reptile), belches toxic gas.
7-8: Horrible Insects! Roll 1D4: (1) Insects that make all your intestines come out your orifices, (2) insects that secretly eat your tongue, replace it and then speak for you, (3) insects that make you come out in boils that then burst into more insects, (4) Insects that get in your stomach and make you give birth to their insect child.
9-10: Newtling witch. Can cast leech swarm; skin+organs turn to 3D6 leeches, attack party.
11-12: Swamp octopus. 2D8 tentacles drag delvers into swamp.
13-14: 2D4 leeches cling to party. If not found, leech 2 points of CON per day.
15-16: 1D6 Bloated bog corpses. Explode with gas that causes vomiting and attracts all insects in large range to you.
17-18: Sentient fungoid mastermind, controls all plants that are coated with its slime.
19-20: 1D4 Ticks. Paralyse you as you sleep.
21-22: Amphisbæna. Check wikipedia page for ideas.
23-24: Chaotic Gnome — Intelligent, telepathic, eats gold, lives in small specially-made vial, when released can only tunnel straight down super fast.
25-26: Bog hag (Anaxial's Roster, p222-223), will perform haruspicy.
27-28: Wrecked ship in tree fern. The tree fern is home to an Olarian, which must be defeated if the delvers are to explore the wreck.
29-30: Swarmhaven. A small Olodo village, besieged by insects. No-one's willing to go out to find and kill the insect god.
31-32: More horrible insects! Roll 1D4: (1) Insects that burrow into your brain and control you, (2) insects that cause massive bloated swellings that release toxic gas when popped, (3) insects that tear through the area devouring all food, (4) insects that get under your fingernails and make you lose control of your fingers at bad times.
33-34: Old shack. Newtling shaman keeps flasks in river with spirits; will sell them. Roll 1D6 for spirit contained in flask:
(1)- Amnesia Spirit (INT-based skills are reduced by the spirit's POW)
(2)- Confusion Spirit (Befuddles victim)
(3)- Disease Spirit (Anaxial's Roster, p224-230)
(4)- Fear Spirit (Demoralises victim)
(5)- Greed Spirit (Victim is enamoured of a specific item)
(6)- Idiocy Spirit (INT of victim reduced by ½ the spirit's POW)
35-36: Tameable giant alligator. Resting — sore tooth.
37-38: Hunting band of dinosaur-riding Slarges from Wongarissi. Remember: they hate humans.
39-40: Friendly black slime ghost.
41-42: Glade of massive, dark red mushrooms; when properly prepared, can be used as nerve poison; paralyses victim for 2 hours, give or take 1D8×10 minutes.
43-44: Quicksand bog, fore-runners are trapped. Sink 30cm per round.
45-46: Even more horrible insects! Roll 1D4: (1) insects that give you uncontrollable shakes, (2) insects that get in your body and slowly grow like a strangler fig until the entire inside of your body is nothing but a giant coiled worm, (3) insects that get right up in your junk, (4) unstoppable army ant insects that swarm over and devour anything in their path.
47-48: 2D4 strangling vines.
49-50: Will o' wisp, attracts party into holes, mud or quicksand against their will.
51-52: The Mere of Dead Faces: Lord of the Rings-like corpses all around water, fires on them, attract anyone who looks at them.
53-54: Poisonous river.
55-56: Alligators pretending to be log in middle of river that needs crossing.
57-58: 2D6 Mosquito women. Emaciated women with wings and proboscides.
59-60: Big marshy lake.
63-64: Bog everywhere. Movement halved. There's a small safe path hidden in the mud.
67-68: Insects intensify; –10 to all skill checks unless delvers can get them off.
69-70: Party of travelling Timinits. Willing to barter with party.
71-72: Party of travelling Uz looking for giant insects. Humans are considered as good insect-bait.
73-74: Still, stagnant pool. Sentient.
75-76: Slorifing wedding/funeral on barge, everyone in white and silent.
77-78: Slorifing party off to pay homage to their Queen. Severed human heads would certainly constitute a nice present to her.
79-80: Grey giant fishing. Low intelligence (INT 2D6), wary of strangers.
81-82: Holy fuck kids it's even more horrible insects! Roll 1D4: (1) Insects that bind you up and fill you full of their young, (2) insects that were inside you the whole time, (3) insects that eat your eyes and other vital organs from inside, (4) insects that know no god or king rise from the earth. The sky turns black. There is nothing but the swarm.
83-84: Hungry Gulper (Gloranthan Bestiary, p22-23).
85-86: Lesser Hydra, 2D6 heads (Gloranthan Bestiary, p24-25; Anaxial's Roster, p179).
87-88: Puffball smoke ghost mushrooms give advice from dead friends.
89-90: Black slime ghosts haunt party. Will arise from their bodies at inconvenient times, making them bleed from eyes. Can be banished temporarily with rum + fire.
91-92: Midget Slashers (Gloranthan Bestiary, p30-31) hiding in ambush until party nears.
93-94: Giant demon toad with fat Orveltor (Gloranthan Bestiary, p34-35) in mouth.
95-96: Gigantic hole in the swamp, all water rushing into it. Leads to Voralan-inhabited underground swamps.
97-98: Drunk Gorakiki Insect Lord.
99: Malevolent Timinit wizard, slowly turns party into plants.
100: Insect god. The party is on its back.