Background: Nathan Jonas "Joey" Jordison (born April 26, 1975), is an American musician, songwriter, record producer and multi-instrumentalist, best known for his work as the former drummer and co-songwriter for the American heavy metal band Slipknot as well as guitarist in the American horror punk band Murderdolls. Jordison played in Slipknot since their formation in 1995 until his departure from the band in December 2013. He was the drummer and founder of the American heavy metal band Scar the Martyr which formed in 2013 and disbanded in 2016.
Context: On November 28, 1995, Mark Anthony Cadavos approached Jordison while he was working, offering him a position in a new project called The Pale Ones. Intrigued and at a point where he was "lost", Jordison attended rehearsals at Anders Colsefini's basement and immediately wanted to be part of this new band. Speaking of this moment he said, "I remember trying so hard not to smile, so I didn't look like I wanted to join, I remained poker-faced, but I thought they ruled." A lot of Slipknot's early development was discussed by band members while Jordison worked night shifts at Sinclair's garage. Of the eventual nine members, Joey was the third to join the band. Slipknot would become pioneers to the New Wave of American Heavy Metal. Jordison is accompanied by two custom percussionists, giving their music a feel that Rolling Stone touted as "suffocating".  Each member of Slipknot is assigned a number; Joey was assigned "#1" because drums are recorded first. Joey has produced one album with Slipknot: 2005 live album 9.0: Live. In August 2008, Jordison broke his ankle and Slipknot had to cancel some of its English tour dates. On August 22, 2009, Jordison was taken to the emergency room for a burst appendix, less than an hour before he was to take the stage for Auburn, Washington's KISW Pain in the Grass concert. As a result, Slipknot canceled following shows in August and September, to give Jordison time to recover.  On December 12, 2013, Slipknot announced through their official website that Jordison had left the band, citing personal reasons for his departure. In response, Jordison released a statement insisting that he had in fact been fired from the band and stated that Slipknot "has been my life for the last 18 years, and I would never abandon it, or my fans".  After years of both sides being silent and evasive as to the reasons for his leaving the band, Jordison revealed in June 2016 that he suffered from transverse myelitis, a neurological disease which cost him the ability to play the drums toward the end of his time with Slipknot.
Question: What is an aspect of Slipknot that the article focuses on?. Whats the answer?
On December 12, 2013, Slipknot announced through their official website that Jordison had left the band,