महाभारतः mahābhārataḥ - book-1, chapter-28, verse-18

अश्वक्रन्देन वीरेण रेणुकेन च पक्षिणा ।
क्रथनेन च शूरेण तपनेन च खेचरः ॥१८॥

18. aśvakrandena vīreṇa reṇukena ca pakṣiṇā ,
krathanena ca śūreṇa tapanena ca khecaraḥ.

18. aśvakrandena vīreṇa reṇukena ca pakṣiṇā
krathanena ca śūreṇa tapanena ca khecaraḥ

18. He fought with the brave Aśvakranda, and with Reṇuka, and with Pakṣin; and with the hero Krathana, and with Tapana, and with Khecara, the sky-dweller.

Words meanings summery:

• अश्वक्रन्देन (aśvakrandena) - by the serpent named Aśvakranda (by Aśvakranda)

• वीरेण (vīreṇa) - by the brave (Aśvakranda) (by the brave one, by the hero)

• रेणुकेन (reṇukena) - by the serpent named Reṇuka (by Reṇuka)

• च (ca) - and

• पक्षिणा (pakṣiṇā) - by Pakṣin (name of a serpent capable of flight, or a winged creature) (by a bird, by a winged one)

• क्रथनेन (krathanena) - by the serpent named Krathana (by Krathana)

• च (ca) - and

• शूरेण (śūreṇa) - by the brave (Krathana) (by the brave one, by the hero)

• तपनेन (tapanena) - by the serpent named Tapana (by Tapana)

• च (ca) - and

• खेचरः (khecaraḥ) - by Khecara (a sky-dwelling serpent, context implies instrumental despite nominative form) (a sky-dweller)

Words meanings and morphology

अश्वक्रन्देन (aśvakrandena) - by the serpent named Aśvakranda (by Aśvakranda)

(noun)

Instrumental, masculine, singular of aśvakranda

aśvakranda - name of a serpent

Compound type : tatpuruṣa (aśva+kranda)

• aśva – horse
  noun (masculine)
• kranda – crying, shouting, roar, call
  noun (masculine)
  action noun
  derived from root krand (to cry)
  Root: krand (class 1)

वीरेण (vīreṇa) - by the brave (Aśvakranda) (by the brave one, by the hero)

(adjective)

Instrumental, masculine, singular of vīra

vīra - brave, heroic; hero, warrior

Note: Adjective for Aśvakranda.

रेणुकेन (reṇukena) - by the serpent named Reṇuka (by Reṇuka)

(noun)

Instrumental, masculine, singular of reṇuka

reṇuka - name of a serpent; name of a sage

च (ca) - and

(indeclinable)

Note: Conjunction.

पक्षिणा (pakṣiṇā) - by Pakṣin (name of a serpent capable of flight, or a winged creature) (by a bird, by a winged one)

(noun)

Instrumental, masculine, singular of pakṣin

pakṣin - bird, winged creature; an arrow

Note: Here used as a name of a participant in the battle, likely a serpent.

क्रथनेन (krathanena) - by the serpent named Krathana (by Krathana)

(noun)

Instrumental, masculine, singular of krathana

krathana - name of a serpent

च (ca) - and

(indeclinable)

Note: Conjunction.

शूरेण (śūreṇa) - by the brave (Krathana) (by the brave one, by the hero)

(adjective)

Instrumental, masculine, singular of śūra

śūra - brave, valiant; hero, warrior

Note: Adjective for Krathana.

तपनेन (tapanena) - by the serpent named Tapana (by Tapana)

(noun)

Instrumental, masculine, singular of tapana

tapana - burning, tormenting; heating; name of a serpent

agent noun

derived from root tap (to heat, torment)

Root: tap (class 1)

च (ca) - and

(indeclinable)

Note: Conjunction.

खेचरः (khecaraḥ) - by Khecara (a sky-dwelling serpent, context implies instrumental despite nominative form) (a sky-dweller)

(noun)

Nominative, masculine, singular of khecara

khecara - moving in the air or sky; a god, a bird, a planet, a cloud, a sky-goer, a demon, a serpent

Compound type : tatpuruṣa (kha+cara)

• kha – sky, ether, space
  noun (neuter)
• cara – moving, going; a mover, a walker
  adjective (masculine)
  agent noun
  derived from root car (to move)
  Root: car (class 1)

Note: Appears as nominative singular but functions as an instrumental noun or name in the list of combatants.