Question: Who founded the metal band who's retrospective box set of albums was entitled Trolsk Sortmetall 1993-1997?

Context paragraphs:
Soundtrack to the Apocalypse: Soundtrack to the Apocalypse is a box set by the American thrash metal band Slayer.  Released November 25, 2003 through American Recordings, the four–disc CD and DVD set features music from previous albums, unreleased material, and live film.  A deluxe edition version (which has the alias "ammo box") was released and featured everything from the standard edition, with the addition of 14 live tracks.  The box set's name originated from an alternative title for 2001's "God Hates Us All".  After discussing among themselves the idea of the box set, the band informed their record company, who initially disliked but later approved the idea.

The Choir (alternative rock band): The Choir is an atmospheric Christian alternative rock band with Derri Daugherty on guitar and vocals, Steve Hindalong on drums, Tim Chandler on bass guitar, Dan Michaels on saxophone and lyricon, and Marc Byrd on guitar.  As of 2016, the band has released 14 studio albums, three EPs, five live albums, one single-disc compilation, and one retrospective box set.

Memories (Barbra Streisand album): Memories is an album released by Barbra Streisand in 1981.  It is primarily a compilation of previously released material, but includes three newly recorded songs.  The album was certified 5× Platinum by the RIAA, reaching number 10 on the US albums chart.  First released on Columbia, it was re-released under the CBS imprint in 1981 with four additional tracks.  In the UK, where it was released as Love Songs, it reached number 1 on the albums chart for nine weeks (seven of them consecutively and it became the UK's best-selling album of 1982, the first album by female performer to achieve it.  The album was certified platinum in the UK (prior to multi-platinum awards being given), and 6× platinum in Australia.  According to the liner notes of Barbra's retrospective box set: Just for the Record, the album also received a record certification in the Netherlands and in Switzerland. Three previously unreleased tracks, "Memory", "Comin' In and Out of Your Life", and "Lost Inside of You" were featured on the album.  "Comin' In and Out of Your Life" was the most successful of the new singles, peaking at #11 on the "Billboard" Hot 100 in the US.

Keep an Eye on the Sky: Keep an Eye on the Sky is a 4-CD, 98-song career retrospective box set from American rock group Big Star, released in 2009.  It features 52 unreleased tracks: demos, alternate takes, and live performances.  As well as material from founder member Chris Bell's earlier bands Rock City and Icewater, it includes all titles (in many cases as alternate mixes or demos) from Big Star's first three studio albums, "#1 Record", "Radio City", and "Third/Sister Lovers", and a recording of a 1973 Big Star concert.  Staged in January at Lafayette's Music Room, the Memphis venue used again in May for the Rock Writers' Convention, the concert took place after Bell's departure and before the remainder of the group began work on "Radio City".  The box set's liner notes won a 2011 Grammy Award for author Robert Gordon.

Ulver: Ulver (Norwegian for wolves) are a Norwegian experimental musical collective founded in 1993, by vocalist Kristoffer Rygg.  Their early works, such as debut album "Bergtatt", were categorised as folklore-influenced black metal, but have since evolved a fluid and increasingly eclectic musical style, blending genres such as rock, electronica, symphonic and chamber traditions, noise, progressive and experimental music into their oeuvre.  1997 marked their international debut with the release of their third album "Nattens madrigal" through German label Century Media.  However, following discord with the label, Kristoffer Rygg formed his own imprint Jester Records in 1998.  British composer and multi-instrumentalist Daniel O'Sullivan joined the collective in 2009, and the band performed some of their first live concerts in their 15-year lifespan, including the prestigious Norwegian National Opera.

From Moscow to Mars: From Moscow to Mars is a retrospective box set from Erasure, released in the UK by Mute Records on 9 December 2016.  The set commemorates the 30th anniversary of the group's founding, and contains an assortment of previously released and never before released material.  Its name is derived from a lyric found within the group's single "Star", "We go waiting for the stars to come showering down... From Moscow to Mars...Universe falling down".

Trash Box: Trash Box is a 5-CD box set of mid-1960s garage rock and psychedelic rock recordings, primarily by American bands.  This box set is similar to the earlier "Pebbles Box" (a 5-LP box set) and includes almost all of the same recordings in that box set (and in the same order), along with numerous bonus tracks at the end of each disc.  Supposedly, "the Trash Box" collects the first five volumes of the CDs in the Pebbles series (i.e., those released by AIP Records, not to be confused with the 4 earlier CDs that were issued by ESD Records).  However, as is generally true of the CD reissues of these five volumes (though not nearly to the same extent), the tracks differ significantly on all five discs as compared to both the original Pebbles LPs and the later Pebbles CDs in the corresponding volumes; and the surf rock rarities on "Pebbles, Volume 4" have been eschewed entirely.  Overall, there are 109 tracks in the box set (excluding the introduction and ending cuts) as compared to 101 songs on the individual CDs and 72 tracks in the "Pebbles Box".  Although most of the recordings on "the Trash Box" were released at some point on one of the individual Pebbles albums, several of the songs have not appeared elsewhere in the Pebbles series.  Inexplicably, one of these songs is the well-known hit "I Fought the Law (but the Law Won)" by the Bobby Fuller Four (on Disc Four) – which is also included in the "Pebbles Box" – in place of the much rarer "Wine Wine Wine" by Bobby Fuller that appears on "Pebbles, Volume 2".

Clouds in My Coffee: Clouds In My Coffee is singer-songwriter Carly Simon's 21st album (and her first box set) released in 1995.  It is a three-disc, 58 song career retrospective box set that spans Simon's career from 1965 to 1995.  Also included are nine previously unreleased or hard-to-find songs.  The booklet includes numerous photographs and extensive liner notes by Simon.

Trolsk Sortmetall 1993-1997: Trolsk Sortmetall 1993-1997 is a retrospective box set of albums by Norwegian black metal band Ulver, issued in 2014 via Century Media.  Limited to 5000 copies, the set collects Ulver's first demo "Vargnatt," together with their first three full-length albums, "Bergtatt", "Kveldssanger" and "Nattens madrigal" with a bonus 4-track rehearsal of songs from "Nattens madrigal," recorded in the summer of 1995.

Dance of the Rainbow Serpent: Dance of the Rainbow Serpent is a 1995 three-CD retrospective box set by Santana that also covers Carlos Santana solo projects and appearances with other artists.  Unless noted, all tracks are studio recordings, with some of them previously unreleased (all are on the third disc).  The individual discs are sub-titled Heart, Soul, and Spirit.  It includes a 60-page booklet with detailed track listing, song comments by Carlos Santana, musician credits, biographical essay and a poem by Hal Miller, a list of touring band members through the years, and a band/solo discography up to 1995.  The cover art was done by Michael Rios and Anthony Machado.

Supporting paragraphs: Trolsk Sortmetall 1993-1997 Ulver
Answer: Ulver (Norwegian for wolves) are a Norwegian experimental musical collective founded in 1993, by vocalist Kristoffer Rygg.