Well, my computer recently blew up and the main harddrive was replaced, but my backup was saved, which is where Oblivion and mods were installed. I've done some extensive repair since then, and I find a few mods acting wierd (Like, Ruin Tail's Tale won't turn off o_O) but it's nothing severe. However, a Fort is on the City Island, and I don't know which mod it's attached to. It's Fort "Voranus", or "Voranis," though I can't remember which spelling is right at the moment. It has a unicorn, though. Anyway, there's two of everything in the fort now! I need to identify what mod it's tied to - I'd like to ask here before I become picky and turn off all my mods.

Oblivion.esm
Oscuro's_Oblivion_Overhaul.esm
Progress.esm
Better Cities Resources.esm
Knights.esp
DLCShiveringIsles.esp
Unofficial Oblivion Patch.esp
UOP Vampire Aging & Face Fix.esp
Oblivion Citadel Door Fix.esp
Shivering OOO.esp
Natural_Weather_with_darker_Nights_by_Max_Tael.esp
phinix-waterfix.esp
BHC_Expanded.esp
ln.esp
MIS.esp
MIS New Sounds Optional Part.esp
Atmospheric Oblivion.esp
36Sermons-Miltiades.esp
AliveWaters.esp
AliveWaters - Koi Addon.esp
AliveWaters - Slaughterfish Addon.esp
Bedrollsanyone.esp
Immersive Combat Music.esp
Mud Crabs!.esp
Mud Crabs!_OOO.esp
Player Hunters Fame and Infamy - Normal.esp
Crowded Roads.esp
Immersive Travelers.esp
Slof's Horses Base.esp
Oscuro's_Oblivion_Overhaul.esp
OOO-Water_Weeds.esp
OOO-Map_Markers_Stock.esp
OOO-No_Guild_Ownership.esp
OOO-DLT_Remover.esp
OOO-Armor_Perks_WearRate_Repair.esp
OOO-Combat_Skills_Perks_Marksmanship.esp
OOO-DaedraLord_Quests.esp
OOO-Dangerous_Traps.esp
OOO-Deadly_Combat.esp
OOO-Magic_Effects+Enchantments.esp
OOO-Magic_Effects+Spells.esp
OOO-Magic_Game_Settings.esp
OOO-Potions.esp
OOO-ThiefGuild_Difficult.esp
OOO-WaterFish.esp
Heroes of Cyrodiil.esp
Heroes of Cyrodiil Part 2.esp
Heroes of Cyrodiil Part 3.esp
Heroes of Cyrodiil Part 4.esp
Heroes of Cyrodiil Part 5.esp
Shady Sam Enhanced.esp
Harvest [Flora].esp
Harvest [Flora] - Shivering Isles.esp
ANB_No_FastTravel.esp
Birthsigns Expanded.esp
Dungeon Actors Have Torches 1.6 DT.esp
P1DkeyChain.esp
ScriptIcon_Replacer.esp
SM Rest.esp
TFE.esp
EnchantmentRestore.esp
EnchantmentRestore_Wells.esp
SM Combat Hide.esp
sycHearNoEvil.esp
Denock Arrows.esp
Combat Behavior 2.11b.esp
Kayo.esp
ProgressGSD.esp
ProgressMBSP.esp
ProgressSBSP.esp
ProgressRBSP.esp
ProgressRacial.esp
ProgressArmorer.esp
ProgressMercantile.esp
OOO-Level_Stock.esp
immersive_caves_manual.esp
Dark Dungeons.esp
Dark Dungeons - SI.esp
tkHairPack01.esp
Corean_hair_for_Original_race.esp
Disable Tutorial Text.esp
Real Lava 1.3.esp
VG0SmarterTimescale.esp
Life_Translated-2681.esp
NE_Realistic_Blocking.esp
Natural Wildlife - resized.esp
Gamblers_of_Cyrodiil.esp
Player Hunters Fame and Infamy - Hard.esp
Duke Patricks - Actors Can Miss Now.esp
TamrielTransportationNetwork.esp
ShiveringIslesTransportationNetwork.esp
TOTF Delayer.esp
ScriptEffectIconReplace.esp
TOTF.esp
PTDoorExploitBegone.esp
Visual Enchantments LessFire.esp
L's Static Creature Level Lists for OOO 1.3.esp
Natural_Habitat_by_Max_Tael.esp
Natural_Water_by_Max_Tael.esp
RTT.esp
Walkabout.esp
As Intended - OOO Boars & Imps.esp
Natural_Vegetation_by_Max_Tael.esp
Vector.esp
TNR ALL RACES FINAL.esp
TNR - ShiveringIsles no helms.esp
show_amulets.esp
SupremeMagicka.esp
SM_ShiveringIsles.esp
SM_Scrolls.esp
SM_SigilStone.esp
SM_EnchantStaff.esp
SM_OOO.esp
SM_VanillaSpells.esp
Enhanced Grabbing.esp
Life Detected - OMOD.esp
EVE_StockEquipmentReplacer.esp
EVE_StockEquipmentReplacer for OOO.esp
Better Cities - Full City Defences.esp
Better Cities .esp
Better Cities Full.esp
Better Imperial City.esp
Better Cities - Tears of the Fiend.esp
Better Cities - Ruined Tail's Tale.esp
Better Cities Full FPS Patch.esp
Better Imperial City FPS Patch.esp
Better Cities - VWD of the IC.esp
Better Cities - No LEYAWIIN Flooding.esp
Enhanced Economy.esp
Enhanced Economy - House prices.esp
Better Cities - House price patch.esp
Update 2.0 Visually Enchanted.esp
WindowLightingSystem.esp
ElsweyrAnequina.esp
_Real_Lights.esp

You can use either FormID Finder or RefScope to identify which mod it is.

Install the fixed version of Natural Weather.

Popular Outdated Mods - http://tesivpositive.animolious.com/?page=popular_outdated_mods <-- link here

...I would go further and replace with All Natural. This would also replace _Real_Lights.esp which has problems. Also you should only be using Eve stock replacer for OOO not the original.

Now what was your problem again... :unsure2: