You play as Raziel, a resurrected vampire that was sentenced to death by his master Kain, but was killed by two of his (Raziel's) brothers, then brought back to life by the Elder God. Raziel wears the colors of the soul devourer, one rank below vampire.
 

<<< Raziel before he got killed.
 
 

<<<   Raziel after (Also see below).
 

Running around a place called Nosgoth you have the ability to go between the Real realm and the Spectral realm, your mission is to find & kill each of Raziel's brothers (they are all vampires to) and "Inherit" an ability from each one of them (once you killed them that is!) & finally confront & kill Kain himself. The ability you get from killing the first boss you will need to use to find the second boss & the ability you get from killing the second you will need to use to find the third and so on.

You can pick up extra health tokens and glyphs to aid you in your quest.
Glyphs are spells that give you a fancy way of killing vampires (& humans) without getting to close, for more info on glyphs see my About Glyphs page by clicking HERE.

You start the game with the ability to grab & move things, pick up things and glide after jumping, the elder god tells you about these abilities early in the game (it also says on the bottom of the screen what you can do sometimes).
Other abilities are acquired by killing bosses.
Early in the game is what I call a "Tutorial" because the elder god tells you about things you come to, Portals, verius enemies, devouring souls, side stepping (shifting between planes) e.t.c.
Don't expect it to be easy though! There are lots of puzzles for you to solve in order for you to progress further.

<<<   Raziel after he got killed.