Here are some of my favorite metal albums released in 2013, with a haiku to go with each one (click on album art for YouTube links):

Gorguts - Colored Sands

Non-linear waveforms
Meditated dissonance
Pushing boundaries

Paysage D'Hiver - Das Tor

Wintertime voyage
Into black forest darkness
Cold serenity

Rotting Christ - Κατά τον δαίμονα εαυτού

Ode to the ancients
Channeling folk symphonies
Unique black metal

Satan - Life Sentence

Dueling guitars
Swift rhythms and harmonies
Always hail Satan

Inquisition - Obscure Verses for the Multiverse

Croaking the obverse
Profoundly, divisively
Scaled classically

Castevet - Obsian

Sharp, serrated notes
As a river erodes stones
Shaped by melody

Summoning - Old Mornings Dawn

The clarion calls
A return to Middle-Earth
As the war drum beats

Hateform - Sactuary In Abyss

Brisk melodic thrash
Tempered with technical flair
Progressive delight

In Solitude - Sister

Nostalgic metal
Reverberates melodic
To merciful fates

Windhand - Soma

Dark, menacing chords
Tinted with insanity
Heavy as a thing

Other notable releases: Carcass - Surgical Steel, Exhumed - Necrocracy, Ruins of Beverast - Blood Vaults, Ulcerate - Vermis, Deafhaven - Sunbather, Intronaut - Habitual Levitations, Church of Misery - Kingdom Scum, SPEkTER - Cypher, Inter Arma - Sky Burial, Tribulation - The Formulas of Death, Clandestine Blaze - Harmony of Struggle, Vhöl - Vhöl.