~420 BR (Underdark).- Tollidor Cataclysm. The town is sunk into the underdark in a cataclysm caused by the Mindflyers.
~10 BR (Underdark - Udos Dro'xun).- Foundation of Udos Dro’Xun.- Lithana Elg'Carin found and rules Udos Dro'xun as the Il'haress of the Elg'Carin Quellar (The Drow House Elg'Carin).
~3 to 4 AR (Udos, Stonehold).- The banites sent a strong but unsuccessful attack against Udos, sieging the unbreakable gates.
~10’s to 20’s AR (Underdark - Udos Dro’Xun).- Chath Z'ress as Ust’ilharess (Matron of the First House and leader of the Drow).
~15 - 16 AR (Underdark - Udos Dro'Xun).- Shairin Dria'fiend (matron mother of house Dria'fiend) managed to destroy all rival houses and merge her house with house Elg'Carin to rule Udos Dro'Xun.
20 AR (Underdark – Urblexis Grond).- Foundation of Urblexis Grond.
20 AR (Underdark).- The Great Banishment. Goblins and Orogs start to create big societies in the UD.
21 AR (Underdark – Urblexis Grond).- A goblin shaman worshipping Oogooboogoo arrived at Grond and founded the goblin tribe known as Clan Oogooboogoo.
24 AR (Underdark – Urblexis Grond).- The kobold dragonshaper Cha'ox was chosen sole ruler of Grond.
~25 AR (Underdark).- The Order of the Black Depth a band of Kobolds founded by the kobold Nastakanoth Meknon, with the Sorcerer Lejir as his liteunant and after Nastkaroth passed away, his leader. The order worked as Grond's Militia and developed a great power under the namagement of Skeflock.
Later internal struggles between the Kobolds and Goblins happened quite frequently. Causing never ending issues. To cease the hostilities, the drow Oblodra created a magical link between the kobold Lejir and the goblin Godo. When either took damage the other one would feel it as well. It caused some, if short-lived, peace between the two factions.
~25 AR (Underdark - Udos Dro’Xun).-
Assination of Fluxsin by forces of Jahn'lara V'raevir, leading to her ascension as first Matron.
During her leadership, took place the Rippers event. Some time later, the V'raevir house got absorb by the Dy'nin House and Phyr'lene Dy'nin becomes first matron.
29 AR (Underdark – Urblexis Grond).- Skeflock became Gronds first Tyrant.
~30’s AR (Underdark – Udos Dro’Xun).- Oblodra Dra'Kaa who rose to the position of Il'haress of the Quellar Dra'Kaa will rule Udos Droxun through political influence and a guild of assasins for over two decades.
30 AR (Underdark – Urblexis Grond).- The Goblin caves separated themselves from Grond.
~34 AR (Underdark).- The secrets of the Obsidian Asylum discovered.
35 AR (Eastern Arelith Coast).- Seize of Gambler's Bluff. A huge army of the Underdark sieges for two weeks the gablers' Bluff before had to retreat.
35 AR (Underdark – Urblexis Grond).- Skeflock, Tyrant of Urblexis Grond sent an army against Wharftown in a not successful attack.
~36 AR (Underdark - Udos Dro'Xun - Urblexis Grond).- The Tyrant Skeflock falls under the manipulation and influence of the drow Ust’ilharess Oblodra Dra'Kaa while the Grondians were confident of their independence.
35 to 43 AR (Underdark – Udos Dro’Xun).- Ami'anthrade set herself up as Illharess of a new Qu'ellar (Matron Mothers, in the order of their House) which she named Z'Kath ("Agony in the common tongue").
~ 36 AR (Underdark - Udos Dro'Xun - Urblexis Grond).- The Tyrant Skeflock falls under the manipulation and influence of the drow Ust’ilharess Nives while the Grondians were confident of their indepence.
~37 to 43 AR (Underdark – Urblexis Grond).- Murag ascend as the new Tyrant of Urblexis Grond, in unknowledge of the Skeflock's traits, becoming the second Tyrant of Grond.
38 AR (Underdark – Urblexis Grond).- The rise of Frubbo's Spynetwork as the Oogooboogoo Clan Chief.
~42 AR (Underdark – Urblexis Grond - Udos Dro'Xun).- Once lost their puppet, who secretly obeyed to Udos Dro'Xun, the drow matron Oblodra Dra'Kaa declared the war against Urblexis Grond, with the intention to vassal the grondians definitively.
44 AR (Underdark – Urblexis Grond).- Orn Gixi, former Overseer, reluctantly took over the Tyrant position of Grond after Murag. After him came: The Svirfneblin Satho Cradfoot; the Svirfneblin Mirdikis; the Orog Golg.
47 AR (Underdark – Udos Dro’Xun).- Disagreement between the Second House of Udos Dro'Xun, Z'kath, and the Ust'illharess Oblodra Drak'aa.
48 AR (Underdark and geography).- The badlands are explored and settled.
49 AR (Underdark – Urblexis Grond).- The goblin clan Oogooboogoo defeats the Eyeless Witch and claims her Hypnotising Necklace.
~50 AR (Underdark – Udos Dro’Xun).- The drow Nives Zar'Rocc took over the position of Oblodra Dra'Kaa and renamed the house as Zar'Rocc. She will lead the drow through the turbulent times after the Cataclysm.
53 AR (The planes and Underdark).- Baator's Awakening (II). The drow try to definitively seal the leys opened to Baator, but they fail.
56 AR (Underdark – Udos Dro’Xun).- The drow matron Nives killed Oblodra and made herself First Matron. [/b]
57 AR (Underdark – Urblexis Grond).- Merago Sapple became the new Chief of Clan Oogooboogoo, after Oboo stepped down.
58 AR (Underdark – Urblexis Grond).- The goblin Bugga Knowz became the new Chief of Clan Oogooboogoo.
61 AR (Underdark – Urblexis Grond).- The goblin chieftain Bugga Knowz reign over the ruins of Urblexis Grond.
61 AR (Underdark and Surface).- Hostilities between underdarkers and surfacers become stronger.
61 AR (Underdark – Udos - Urblexis).- Great Cataclysm on the Underdark. In one brutal attack, swarms of mind flayers attacked both Udos Dro'xun and Urblexis Grond, destroying both settlements.
61 AR (Underdark – Urblexis Grond - Blingstonhold).- Foundation of Blingstonhold by the Svirneflin exiled from the destroyed Urblexis Grond.
~61 to 66 AR (Underdark).- The goblin Queen Bugga Knowz recovered a powerful artefact called the Psychotic necklace from the Eyeless Witch.
62 AR (Underdark – Pit Town).- The Pit Town foundation as a haven against the Mindflyers. Most of the surviving former residents of Udos and Urblexis settled in Pit Town.
~66 AR (underdark – Pit Town).- Spets became the new Chieftain of Clan Oogooboogoo and "Queen of the Goblin Kingdom", including the domain of Urblexis Grond.
~70’s AR (Magic Phenomena).- The Wave gets a new distortion in Arelith, making the mages in need to enforce their spells with new material components to get a stronger bound with the Wave.
76 AR (Underdark – Pit Town).- The Hunters Guild, a battle group made to counter the Ilithid menace, moves into the Pit Town on call from Overseer Nakal.
76 AR (Underdark – Pit Town – Udos Dro’Xun).- War against Udos Dro’xun and Pit Town and fall of Zar’Rocc Qu’ellar (Drow House Zar'Rocc).
76 AR (Underdark - Blingstonhold – Brogendenstein).- In the last month takes place the first meeting between Blingstonhold and Brogendenstein representatives to renew the Earthkin Pact.
77 AR (Underdark – Blingstonhold – Udos Dro’Xun).- First War between Udos Dro’xun and Bligstonhold, where the gnomes led by Fraya managed to stay in peace.
78 AR (Underdark – Blingstonhold – Udos Dro’Xun).- Second War between Udos Dro’xun and Bligstonhold. Again the diplomatical maneuvers of Fraya led to a tied peace.
78 AR (Underdark – Pit Town – Udos Dro’Xun).- Pit Town Overseer Nakal departs leaving the rule in hands of Damien Tagnik'Zurr who claims the leadership and positioning of Governor of Pit under vassalge of Udos.
79 AR (Underdark ).- A Council of Races of the Underdark is made to deal with the Mindflayers threat.
80+ AR (Underdark – Pit Town).- Goblin War against the soldiers of Amn.
80 AR AR (Underdark – Blingstonhold – Udos Dro’Xun).- The Ust’ilharess of Udos gave an ultimatum to Bligstonhold. But the regent Fraya avoids the war through a successful a definitive diplomace, ending the war.