shadow realm

Short definition from Wiktionary

Noun

1. 1
   Oblivion; death.
2. 2
   Knocked out, rendered unconscious.
3. 3
   Alternative letter-case form of Shadow Realm (“a place that is inhabited by darkness, evilness or benevolent entities and creatures, sometimes based around, or said to be, shadows or personifications thereof”).

Proper noun

1. 1
   Alternative letter-case form of shadow realm (“oblivion; death; knocked out”).
2. 2
   A place, often another world, universe or supernatural plane, that is inhabited by darkness, evilness, or benevolent entities and creatures, sometimes based around, or said to be, shadows, or personifications thereof.