Vvardenfell is a dangerous place for all Outlanders, and if you are not careful in your relations with the powerful Houses and organizations that control the island, you are in for trouble.
House Redoran controls Vivec City (along with the Tribunal Temple) and most of the south and south-west coast of the island. The righteous and noble House Redoran has a strong business relationship with the Temple and Archcanon Tarvus, and the Redorans are very serious about duty towards the House, religion and family. Redorans are supporters of the Ebonheart Pact, and their military forces play an important role in the Alliance War. Purposeful and brave redorans consider themselves above other Great Houses. Members of the House Redoran can be recognized by the red color and the scarab symbol.
The mysterious Telvanni House, based in Sadrith Mora, controls the eastern shore of Vvardenfell and lives in voluntary isolation from most other Dark Elves. The leaders of the House dwelling in huge mushroom towers work diligently to perfect the magical arts. Those who refused to join the Ebonheart Pact of Telvanni are suspicious and xenophobic towards outsiders (even by the standards of the Dark Elves) and continue to own slaves despite the Pact, and therefore are under the scrutiny of other Houses. For Telvani, power is the ultimate goal, and they respect only those who in any way proved their superiority. Ambitionous, insidious and aggressive Telvanni represent a dangerous and at the same time a mysterious House. The members of the House Telvanni can be recognized by a brown color and a symbol with spiral energy flows.
The cosmopolitan House Hlaalu controls Seyda Neen, but House members can be found in most of the cities of Vvardenfell, more precisely, in their markets and in meeting rooms. Members of House Hlaalu like to negotiate, make deals and save a fortune, and most are more than willing to compromise for the sake of conflict resolution. On the other hand, the love of Hlaalu House members for cultural achievements and city life has created them a reputation (perhaps incorrect) of corrupt and greedy bureaucrats. Be that as it may, House Hlaalu supports the Ebonhart Pact and has the respect of the Tribunal Temple. The members of the House Hlaalu can be recognized by the yellow color and the scales symbol.
The holy warriors of the Tribunal Temple of the four orders of Temple Ordinators defend the interests and possessions of the Living Gods on and beyond Vvardenfell. Each order has its own special role in the organization: the Order of War fights against the enemies of the Temple, the Order of Inquisition searches for heresy among the priests and lay people, the Order of the Watch guards temples and sanctuaries, and the Order of Doctrine and Ordination are militant scientists. Most of the Ordinators are recruited from the House Indoril, but in their ranks there are members of all Great Houses. Ordinators can be recognized by their distinctive golden armor and face masks.
Morag Tong is an ancient and deadly guild of assassins, carrying out legalized orders for murder throughout Morrowind. The organization performs an important function within the society of the Dark Elves, since their legally sanctioned Writs of Execution can avoid massive bloodshed between rival Great Houses. First, these orders are carefully considered by the Grandmaster of the guild, and after his approval they are executed fanatically and ruthlessly. When the writ is executed, the Morag Tong assassin appears to others and demonstrates the contract to confirm the lawfulness of the murder and avoid reprisals against himself. With rare exceptions, the organization seldom conducts business outside Morrowind, but in the Dark Elf homeland, there is no corner where the guild of Morag Tong could not penetrate. If you are at the sight of Morag Tong, be sure that you will be finished quickly, inexorably and absolutely legitimately.