Large humanoid monsters who eat human flesh. They are massive opponents which can pack a hard punch, but they have little to no intelligence whatsoever, which is their main downfall and the reason why they attack in small numbers and use poor strategies.  It can easily be fooled and should be approached only through ranged weapons to avoid their pure melee strength.
 

There are 3 types of trolls in Tamriel, but the most common is the brown troll which has an ape-like appearance and is very athletic and fast, but they are moderately weak and can easily be killed with several hits, but make sure the battle is quick and fast, because they can regenerate at a amazing rate, making your attacks useless.  Be sure to torch its body to prevent the troll from coming back to life.
 

These are large, intelligent and dangerous opponents which fight either with their hands or wielding weapons. They are amongst the most dangerous and strongest opponents you will face in the Imperial Province, if you aren't well prepared to face this adversary, it is best to flee.

 

Ancient half-man half-spider creature, originally aquatic, but all Dreughs go through a land dwelling period in their lives, called Karvinasim, during this period they can grow up to 4 times their original size and have serious deformations from their original shape which was more octopus-like.  Never the less, these monsters are deadly, it is wise to not underestimate them and be prepared whenever you face one.  Can be damaged with any type of weapon.
 

Powerful and elusive creatures, Spriggans are amongst the most common creatures met in the Ninbenay Valley and in the the south-eastern borders of Blackwood.  They are social creatures and are known to attack in up to 2 or 3 numbers, but can easily be defeated with fire magic.  However, though they are moderately powerful, they are known to resurrect several times, so, unless you you kill them several times, don't be surprised if it comes back to get you.
 

Possibly one of the most common met monsters in the Central Province of Tamriel, though they are physically weak and aren't very bright, they are social and often form clans led by Goblin Chieftains.  Well know for their crafting, goblins are capable of making traps, armour and weapons.
 

Weak form of undead, found anywhere evil lurks. These undead creatures are amongst the most weakest adversaries you will meet, however they are often found in large numbers, composing of different member groups, such has archers, warriors and often mages.  They are vulnerable to any form of attack, so you don't need enchanted weapons or magic for these guys.

 

Reanimated bodies of fallen adventurers, they are brought back to life to serve their necromantic masters and NO! they don't eat brains, unless they have a weird necromancer who would order them to (go figure).  They are a very weak form of undead, but they are still feared, for they can inflict a terrible disease to anybody who doesn't keep his distance.  Can be damaged with any type of weapon.
 

These undead creatures come in many varieties, from the moderately powerful ghostly spirit, to the invincible spell-casting wraith. They are immune to physical damage so it's best that you strike only with magic or enchanted weapons.  Not all ghosts or wraiths are potential enemies, some might even send you on a quest for them, like finding out who murdered them and why.

 

An extremely powerful undead. A lich is a spell caster who seeks to defy death by magical means. The lich converts themselves into an undead state by means of necromancy, which offers them the immortal life, but traps them into a decaying dead body. During these long years, they dedicate their time studying the dark arts of necromancy and eventually become mad and evil from the changes in the world.  They eventually become powerful spell casters of immense intelligence.  Almost all weapons are ineffective towards them, except mythril and enchanted weapons.
 

One of the weakest beings of Oblivion.  Servants of the Daedric God of Destruction, Mehrunes Dagon, they are cowardly creatures of little intellect, but they can be very annoying when in large numbers. As a Daedra it requires enchanted weapons or weapons forged from valuable metals such has silver or mythril to do them harm.

 

Intelligent, Sophisticated and Powerful. These are the knights of Oblivion and the strongest form of Daedric minions you will ever encounter, they posses numerous combat capabilities, from wielding giant Daedric weapons, to casting powerful and crippling spells.  Proud of their reputation, these monsters serve the Daedric god of destruction, Mehrunes Dagon and are pleased to attend to his will of violence, destruction and chaos.  Word to the wise: never, ever, attack a Dremora from a level lower than 20.

 

Small and relatively intelligent, Imps are the least evil of all Daedra. They are described as dark, shadowy creatures, while mischievous and somewhat destructive, they aren't a really dangerous adversary and can easily be defeated with the use of a mythril or silver weapon, however, they are capable of casting spells, so don't underestimate their abilities.

 

The word "Deadroth" is actually the singular form for Daedra.  Known has lesser Daedras, these fire-breathing, large reptilian monsters serve the Daedric lord of Enslavement, Molag Bal and are weaker then most of the other Daedric minions, but they still maintaining a terrible reputation for their melee combat and spell casting powers. It is best to use mythril or silver against them, magic weapons never hurt either.
 

Small lizard-like creatures, Clanfears are amongst the most common encountered Daedras of Oblivion, they are slightly intelligent and often attack in large numbers.  Don't be fooled by their size and their weak appearance, these servants of Mehrunes Dagon are very dangerous and can pack a awful punch to unprepared adventures,  though they don't cast spells or use any form of magic.  Their hearts are generally hunted for alchemy and magic purposes.