The primary feature/function of SoT is to add random and constant attacks/encounters.
The attacks and encounters are vary balanced and the types of encounter you will experience is based on your play-style and the location you are currently in.

SoT will create random encounters in dungeons while exploring (separate from reinforcements--see our "Spawns" page). They tend to be the Undead variety, and may attack in a mob size fashion. Mob size can be adjusted in the MCM menu. Both Armored Undead and Rotting Undead--where the flesh can be seen falling off--as well as others can appear, though not in the same encounter. Both are tough because many of them use armor and magic. There is also a chance of Bandits appearing instead. Keep in mind that the Added Spawn feature can add reinforcements while this encounter takes place. This module can feed the other.

(Surface and Dungeon)

Waiting encounters will take place after the waiting time has finished counting down. A message will appear alerting you to some sign that you are not alone.

(Surface and Dungeon)

Walking encounters are designed to take place away from towns and NPCs. We do not want them hurt and spoiling quests if at all possible.

Possible encounters include animal predators, ice trolls in snow areas, and assorted bandits and goblins. It has been rumored that Dark Brotherhood hit squads roam after sunset in dark shadowy areas, and Silver Hand Werewolf Hunters roam the land looking for the wolves.

Night time is now very dangerous, with hungry Vampire Lords and their minions roaming the land after midnight looking for warm blood... With Draman Skeletal Hordes seeking to avenge their fallen Dragon Masters... And the deadly elite Assassins hunting for you in the shadows...

Encounters are leveled and not meant to overwhelm. But they are leveled per actor, resulting in tougher fights than vanilla Skyrim. You will be challenged.

Beware of extra tough bosses, Bane, if you are a werewolf, and Blade, if you are a vampire.

There is a small chance of a hungry band of refugees attacking the player. These are poorly armed pitiful people and the Goddess Mara watches over them. Hurt them at your own peril, subdue them and be rewarded.

Further, you will now be subject to Shrine and Tomb Desecration encounters. If you decide to take the risk and "loot" a shrine, there could be some punishment from an angry deity. Lastly, relieving the dead of their supposed no-longer-wanted belongings could end up teaching you that "respect for the dead" is more than just a saying.

See this feature in action!

Video demonstration #2.

(Please note that the image looks awkward since the recording was done on a multi-monitor setup.)

(Everything is toggable on or off as you see fit.)

Traveling Healers:

During your journey you will encounter various healers now. (Note: They are not companions that will follow.)
To help low level players there are now 6 new Healers in Skyrim. One of the healers stays in Riverwood, while the others travel from town to town.

Wandering Merchants:

Whilst venturing further into the darkness of a dungeon, you may encounter a merchant! They could be the difference between a life of rejoicing, or a pitiful death. Merchants know that there are treasure chests full of grand loot, and will sometimes risk life and limb in a dungeon so they can add great valuables to their goods for sale. If you are lucky enough, you might just happen upon one which will be able to sell you the much needed health potion.

Heroes:

Along your way, you may happen to catch the attention of a knight known as Asyrin. If he hears battle nearby, and things sound as if they aren't going well, he'll teleport himself nearby to lend aid. (This is to help lower level characters in dyer circumstances.)

(Special Boss Hunters & New Encounters)

If the Player kills an innocent person, Burning Inferno will avenge their death. This includes citizens, shop keepers, kids, etc.

Here is a knowledgeable user upon his first brush with Burning Inferno:

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USER: memlapse

"After several playthroughs without seeing anything remotely resembling Inferno, I was happily slaughtering a large group of bandits, when out of fricking nowhere comes this flaming horror with maggots and skeletons and fireballs and this dammed cage thing that kept trapping me. I have never had my ass kicked so thoroughly. After getting knocked down for the 30th time and chugging my last potion, I was done for. It was glorious."
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Further, if you choose to become either a vampire or a werewolf, then there will be consequences in response to your choice to become a creature of the night. You can be hunted down by one of the brothers Blade or Bane. Neither of them take too kindly to evil creatures and will be relentless in pursuing you. Once you are (un)fortunate enough to meet one, prepare yourself.

Also, there will be attacks by Boethia Worshippers if you fail the quest Boethia's Calling (a level 30 quest).

(Assassins have their own page, click here to see it.)

SoT adds its own unique assassins in addition to what is included in the vanilla game or the DLCs.
This feature completes the feeling of the never ending dread that every SoT player is privileged to endure.  

City Assassins:

These unique assassins are also doppelgangers and come with their own special back story. They blend in by mimicking the looks of an NPC that dwells inside the city and will only strike when the time is right to pull of an effective kill.

Wilderness Assassins:

Much like the city assassins, only they (notice the plural) will come after you like a pair of intelligent raptors where only the highest skilled warriors could possibly defend himself from their assault.

Due to the nature of this special encounter, a special page is dedicated to them. To find out more
about this advanced feature, please click here.

See this feature in action!

(Yes, the link's destination is intentional.)

They are awake, but still sleep. Dead to life, but still living.

After venturing and beginning to feel like an accomplished party, there is news from town of an atrocious threat, that thrives on death and is seemingly unstoppable. There are now (optionally) hordes of zombies--which we call the Rumiirua--attacking the major strong holds.
They are a vile, relentless, destructive force that only a true hero can quell. Do you have what it takes? Probably not.

The forces will continue to keep attacking the strongholds, ushering terror for the citizens until someone finds a way to stop them.
The Rumiirua (zombie) apocalypse is our very own quest line and adventure just for you. It well send you far and wide to find the cause of this undead uprising and will end with an ultimate deadly encounter--if you make it that is. The story is rich, and full of adventure and will invoke feelings of accomplishment like no other quest has.

To read more about the Rumiirua, you can visit our Library and enjoy the lore-friendly, (back) stories our team has created for you.