योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-36, verse-2

मातङ्गशवशैलेषु विश्रान्ताम्बुदपङ्कतिषु ।
यक्षरक्षःपिशाचेषु क्रीडत्सु रुधिरार्णवे ॥ २ ॥

mātaṅgaśavaśaileṣu viśrāntāmbudapaṅkatiṣu ,
yakṣarakṣaḥpiśāceṣu krīḍatsu rudhirārṇave 2

2. mātaṅgaśavaśaileṣu viśrāntāmbudapaṅkatiṣu
yakṣarakṣaḥpiśāceṣu krīḍatsu rudhirārṇave

2. yakṣarakṣaḥpiśāceṣu krīḍatsu rudhirārṇave
mātaṅgaśavaśaileṣu viśrāntāmbudapaṅkatiṣu

2. While Yakṣas, Rākṣasas, and Piśācas (demonic beings) played in an ocean of blood, on mountains formed from elephant corpses where rows of clouds rested.

Words meanings summery:

• मातङ्गशवशैलेषु (mātaṅgaśavaśaileṣu) - on mountains of elephant corpses

• विश्रान्ताम्बुदपङ्कतिषु (viśrāntāmbudapaṅkatiṣu) - where rows of clouds rest

• यक्षरक्षःपिशाचेषु (yakṣarakṣaḥpiśāceṣu) - among Yakṣas, Rākṣasas, and Piśācas

• क्रीडत्सु (krīḍatsu) - playing, while playing

• रुधिरार्णवे (rudhirārṇave) - in an ocean of blood

Words meanings and morphology

मातङ्गशवशैलेषु (mātaṅgaśavaśaileṣu) - on mountains of elephant corpses

(noun)

Locative, masculine, plural of mātaṅgaśavaśaila

mātaṅgaśavaśaila - mountain of elephant corpses

Compound type : tatpuruṣa (mātaṅga+śava+śaila)

• mātaṅga – elephant
  noun (masculine)
• śava – corpse, dead body
  noun (neuter)
• śaila – mountain, rock
  noun (masculine)

Note: Refers to the battlefield covered with elephant corpses resembling mountains.

विश्रान्ताम्बुदपङ्कतिषु (viśrāntāmbudapaṅkatiṣu) - where rows of clouds rest

(adjective)

Locative, masculine, plural of viśrāntāmbudapaṅkti

viśrāntāmbudapaṅkti - having rows of resting clouds

Compound type : bahuvrīhi (viśrānta+ambuda+paṅkti)

• viśrānta – rested, reposed, having rested
  adjective
  Past Passive Participle
  Derived from root √śram (to be weary, to rest) with prefix vi-.
  Prefix: vi
  Root: śram (class 4)
• ambuda – cloud (lit. 'water-giver')
  noun (masculine)
  Derived from 'ambas' (water) + root √dā (to give).
  Root: dā (class 3)
• paṅkti – row, line, series
  noun (feminine)

Note: Modifies 'mātaṅgaśavaśaileṣu'.

यक्षरक्षःपिशाचेषु (yakṣarakṣaḥpiśāceṣu) - among Yakṣas, Rākṣasas, and Piśācas

(noun)

Locative, masculine, plural of yakṣarakṣaḥpiśāca

yakṣarakṣaḥpiśāca - Yakṣas, Rākṣasas, and Piśācas (types of supernatural/demonic beings)

Compound type : dvandva (yakṣa+rakṣas+piśāca)

• yakṣa – a class of semi-divine beings, often guardians of wealth
  noun (masculine)
• rakṣas – a Rākṣasa, a demon, an evil being
  noun (masculine)
• piśāca – a Piśāca, a ghost, a goblin, a flesh-eating demon
  noun (masculine)

क्रीडत्सु (krīḍatsu) - playing, while playing

(adjective)

Locative, masculine, plural of krīḍat

krīḍat - playing, sporting

Present Active Participle

From root √krīḍ (to play).

Root: krīḍ (class 1)

Note: Modifies 'yakṣarakṣaḥpiśāceṣu'.

रुधिरार्णवे (rudhirārṇave) - in an ocean of blood

(noun)

Locative, masculine, singular of rudhirārṇava

rudhirārṇava - ocean of blood

Compound type : tatpuruṣa (rudhira+arṇava)

• rudhira – blood
  noun (neuter)
• arṇava – ocean, sea
  noun (masculine)