Here's a challenging world and two challenging embarks.
The world/embark(s) feature:
A 2x2 embark area.
Dead Civ. No-one is coming to help you, beyond the two starting waves of migrants, no caravans.
A Dry Cavern. Just bloodthorn trees. No water, shrubs, or plants.
One Cavern, rather than two or three.
No surface trees.
No surface vegetation.
No surface water.
All wild animals entering the embark are undead/animated corpses.
The embark is Untamed Wilds + Evil (Terrifying), so you'll get giant animals as well as animal people, all as undead/animated corpses.
The embark region features reanimation of the recently deceased.
Sand
Steel Friendly: iron bearing ore, flux, coal+lignite (2000+ of each)
Magma within 14 Z-levels of the embark level.
A 'within embark range' Necromancer Tower.
No humans, elves, kobolds, titans, megabeasts, semi-megabeasts, clowns or candy.
Also, no access to pig tails (seeds or otherwise) from the dead civ.
The first embark has no aquifer, and as a result, no water of any kind. Not on the surface, not in an aquifer, not in the caverns.
The second embark has a tiny aquifer, for those who would like the easier challenge of having a water source present.
Otherwise, the embarks are in the same region, "The Dunes of Sullying", and both should play in Fortress Mode as mostly identical.
To ensure this works as expected, I've taken this parameter set, edited only the worldgen.txt file in a brand new install of DF 47.04, generated the world, and embarked in the indicated locations. Everything works as anticipated on Windows 10.
However, I've also put a .7z of the generated world on DFFD
here, which should work cross-platform in the same version, if it doesn't generate for you.
If you're looking for a play-through goal, try and build an above ground 3+ storey fort in either embark.
worldgenCreated in DF v0.47.04.
[WORLD_GEN]
[TITLE:CORPSES_REANIM]
[SEED:UXELSThmgpuA6J8AOqzP]
[HISTORY_SEED:DwMAFe6BXJXUIPVEUOxt]
[NAME_SEED:zs7rnFkz0xEKbfwETsFd]
[CREATURE_SEED:clkMlJE156VWKb1nf4bl]
[DIM:17:17]
[EMBARK_POINTS:0]
[END_YEAR:200]
[BEAST_END_YEAR:200:-1]
[REVEAL_ALL_HISTORY:0]
[CULL_HISTORICAL_FIGURES:1]
[ELEVATION:100:100:0:0]
[RAINFALL:0:0:3200:3200]
[TEMPERATURE:-10:75:3200:3200]
[DRAINAGE:0:74:3200:3200]
[VOLCANISM:0:100:0:0]
[SAVAGERY:0:100:0:0]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[POLE:NONE]
[MINERAL_SCARCITY:100]
[MEGABEAST_CAP:0]
[SEMIMEGABEAST_CAP:0]
[TITAN_NUMBER:0]
[TITAN_ATTACK_TRIGGER:0:0:0]
[DEMON_NUMBER:0]
[NIGHT_TROLL_NUMBER:0]
[BOGEYMAN_NUMBER:0]
[NIGHTMARE_NUMBER:0]
[VAMPIRE_NUMBER:0]
[WEREBEAST_NUMBER:1]
[WEREBEAST_ATTACK_TRIGGER:0:0:0]
[SECRET_NUMBER:1]
[REGIONAL_INTERACTION_NUMBER:1000]
[DISTURBANCE_INTERACTION_NUMBER:0]
[EVIL_CLOUD_NUMBER:0]
[EVIL_RAIN_NUMBER:0]
[GENERATE_DIVINE_MATERIALS:0]
[ALLOW_DIVINATION:0]
[ALLOW_DEMONIC_EXPERIMENTS:0]
[ALLOW_NECROMANCER_EXPERIMENTS:0]
[ALLOW_NECROMANCER_LIEUTENANTS:0]
[ALLOW_NECROMANCER_GHOULS:0]
[ALLOW_NECROMANCER_SUMMONS:0]
[GOOD_SQ_COUNTS:0:0:0]
[EVIL_SQ_COUNTS:289:0:289]
[PEAK_NUMBER_MIN:0]
[PARTIAL_OCEAN_EDGE_MIN:0]
[COMPLETE_OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:25]
[REGION_COUNTS:SWAMP:0:0:0]
[REGION_COUNTS:DESERT:0:0:0]
[REGION_COUNTS:FOREST:0:0:0]
[REGION_COUNTS:MOUNTAINS:0:0:0]
[REGION_COUNTS:OCEAN:0:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:0:0:0]
[REGION_COUNTS:HILLS:0:0:0]
[EROSION_CYCLE_COUNT:1000]
[RIVER_MINS:0:0]
[PERIODICALLY_ERODE_EXTREMES:0]
[OROGRAPHIC_PRECIPITATION:0]
[SUBREGION_MAX:5000]
[CAVERN_LAYER_COUNT:1]
[CAVERN_LAYER_OPENNESS_MIN:100]
[CAVERN_LAYER_OPENNESS_MAX:100]
[CAVERN_LAYER_PASSAGE_DENSITY_MIN:0]
[CAVERN_LAYER_PASSAGE_DENSITY_MAX:0]
[CAVERN_LAYER_WATER_MIN:0]
[CAVERN_LAYER_WATER_MAX:12]
[HAVE_BOTTOM_LAYER_1:1]
[HAVE_BOTTOM_LAYER_2:0]
[LEVELS_ABOVE_GROUND:8]
[LEVELS_ABOVE_LAYER_1:8]
[LEVELS_ABOVE_LAYER_2:1]
[LEVELS_ABOVE_LAYER_3:1]
[LEVELS_ABOVE_LAYER_4:1]
[LEVELS_ABOVE_LAYER_5:2]
[LEVELS_AT_BOTTOM:1]
[CAVE_MIN_SIZE:1]
[CAVE_MAX_SIZE:1]
[MOUNTAIN_CAVE_MIN:0]
[NON_MOUNTAIN_CAVE_MIN:0]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:1]
[TOTAL_CIV_POPULATION:0]
[SITE_CAP:0]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:0:0:0]
[RAIN_RANGES:0:0:0]
[DRAINAGE_RANGES:0:0:0]
[SAVAGERY_RANGES:0:0:0]
[VOLCANISM_RANGES:0:0:0]
[PS_VL:100:100:100:100:100:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:100:100:100:100:100:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:100:100:100:100:100:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:100:100:100:100:100:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:100:100:100:100:100:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_VL:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0]
[PS_SV:0:0:0:0:0:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:0:0:0:0:0:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:0:0:0:0:0:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:0:0:0:0:0:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:0:0:0:0:0:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
[PS_SV:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100:100]
embark location1 (with no water of any kind)embark location2 (with tiny aquifer)