महाभारतः mahābhārataḥ - book-6, chapter-3, verse-21

अग्निवर्णा यथा भासः शस्त्राणामुदकस्य च ।
कवचानां ध्वजानां च भविष्यति महान्क्षयः ॥२१॥

21. agnivarṇā yathā bhāsaḥ śastrāṇāmudakasya ca ,
kavacānāṁ dhvajānāṁ ca bhaviṣyati mahānkṣayaḥ.

21. agnivarṇāḥ yathā bhāsaḥ śastrāṇām udakasya ca
kavacānām dhvajānām ca bhaviṣyati mahān kṣayaḥ

21. śastrāṇām udakasya ca kavacānām dhvajānām ca
bhāsaḥ yathā agnivarṇāḥ mahān kṣayaḥ bhaviṣyati

21. There will be a great destruction (kṣaya), as the glow of weapons and water, and of armors and banners, will be like fire.

Words meanings summery:

• अग्निवर्णाः (agnivarṇāḥ) - fire-like (of the glows) (fire-colored, fiery, bright like fire)

• यथा (yathā) - as, like (as, just as, like, in which manner)

• भासः (bhāsaḥ) - the glows (light, luster, gleam, glow)

• शस्त्राणाम् (śastrāṇām) - of weapons (of weapons, of instruments)

• उदकस्य (udakasya) - of water

• च (ca) - and (and, also)

• कवचानाम् (kavacānām) - of armors (of armors, of coats of mail)

• ध्वजानाम् (dhvajānām) - of banners (of banners, of flags, of standards)

• च (ca) - and (and, also)

• भविष्यति (bhaviṣyati) - there will be (it will be, there will be, it will happen)

• महान् (mahān) - great (great, large, mighty)

• क्षयः (kṣayaḥ) - destruction (kṣaya) (destruction, decay, loss, end)

Words meanings and morphology

अग्निवर्णाः (agnivarṇāḥ) - fire-like (of the glows) (fire-colored, fiery, bright like fire)

(adjective)

Nominative, masculine, plural of agnivarṇa

agnivarṇa - fire-colored, fiery, having the color or appearance of fire

Compound type : bahuvrīhi (agni+varṇa)

• agni – fire, sacred fire, god of fire
  noun (masculine)
• varṇa – color, tint, appearance, class, caste, syllable
  noun (masculine)
  Root: vṛ (class 9)

Note: Agrees with 'bhāsaḥ'

यथा (yathā) - as, like (as, just as, like, in which manner)

(indeclinable)

भासः (bhāsaḥ) - the glows (light, luster, gleam, glow)

(noun)

Nominative, masculine, plural of bhās

bhās - light, luster, splendor, ray, appearance

Note: Nominative plural of 'bhās' (masculine form) or 'bhāḥ' (feminine form) is bhāsaḥ. Here, seems masculine in agreement with 'agnivarṇāḥ'.

शस्त्राणाम् (śastrāṇām) - of weapons (of weapons, of instruments)

(noun)

Genitive, neuter, plural of śastra

śastra - weapon, instrument, iron tool, sword

Root: śas (class 2)

उदकस्य (udakasya) - of water

(noun)

Genitive, neuter, singular of udaka

udaka - water

च (ca) - and (and, also)

(indeclinable)

कवचानाम् (kavacānām) - of armors (of armors, of coats of mail)

(noun)

Genitive, neuter, plural of kavaca

kavaca - armor, coat of mail, breastplate

ध्वजानाम् (dhvajānām) - of banners (of banners, of flags, of standards)

(noun)

Genitive, masculine, plural of dhvaja

dhvaja - flag, banner, standard, mark, sign

च (ca) - and (and, also)

(indeclinable)

भविष्यति (bhaviṣyati) - there will be (it will be, there will be, it will happen)

(verb)

3rd person , singular, active, future indicative (lṛṭ) of bhū

Root: bhū (class 1)

Note: Subject is 'kṣayaḥ'

महान् (mahān) - great (great, large, mighty)

(adjective)

Nominative, masculine, singular of mahat

mahat - great, large, mighty, extensive, noble

Note: Agrees with 'kṣayaḥ'

क्षयः (kṣayaḥ) - destruction (kṣaya) (destruction, decay, loss, end)

(noun)

Nominative, masculine, singular of kṣaya

kṣaya - destruction, decay, decline, loss, end

From root √kṣi (to decay, to perish)

Root: kṣi (class 5)

Note: Subject of 'bhaviṣyati'