{{MusicArticle
| titleen     =Severity
| titlejprom  =shousou retsujitsu
| titlejp     =秋霜烈日
| group       =[[Silver Forest]]
| groupCat    =Silver Forest
| released    =2015-10-18
| convention  =Autumn Reitaisai 2
| tracks      =4
| genre       ={{Genre|Vocal}}, {{Genre|Instrumental}}, {{Genre|Rock}}, {{Genre|Hardcore}}, {{Genre|J-Pop}}, {{Genre|Techno}}
| length      =
| catalogno   =
| website     =[http://www.silver--forest.com/sr.htm Link]
| image       =秋霜烈日.jpg
| caption     =Pictured: [[Aya Shameimaru]]
| banner      =
| arranger    =NYO
: ktr
: KaNa
: K.MASERA
| lyricist    =
| vocalist    = ichiko
: {{アキ}}
| producer    =
| illustrator =
| masterer    =
| description =It features vocal and instrumental arrangements of themes from ''[[Imperishable Night]]'', ''[[Mountain of Faith]]'', ''[[Legacy of Lunatic Kingdom]]'' and ''[[Magical Astronomy]]''.

| tracklist   =

*{{track|01|active emotion|lyrics=Lyrics: active emotion}}
** arrangement: NYO
** vocals: ichiko
** original title: {{lang|ja|天空のグリニッジ}}
** source: {{MA}}

*{{track|02|Thermal|lyrics=Lyrics: Thermal}}
** arrangement: ktr
** vocals: {{アキ}}
** original title: {{lang|ja|千年幻想郷　～}} History of the Moon
** source: {{IN}}

*{{track|03|Pumpkin of September-31}}
** arrangement: KaNa
** original title: {{lang|ja|九月のパンプキン}}
** source: {{LoLK}}

*{{track|04|liquid state survivor}}
** arrangement: K-MASERA
** original title: {{lang|ja|神々が恋した幻想郷}} 
** source: {{MoF}}
}}