The death of Vikarna.

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Quote.

The seven sons of thine that were thus slain were Satrunjaya, Satrusaha, Chitra, Chitrayudha, Dridha, Chitrasena & Vikarna. Amongst all thy sons thus slain, Vrikodara, the son of Pandu, grieved bitterly from sorrow for Vikarna who was dear to him. Bhima said "Even thus was the vow made by me, that all of you should be slain by me in battle. It is for that, O Vikarna, that thou hast been slain. My vow hath been accomplished. O hero, thou camest to battle, bearing in mind the duties of a Kshatriya. Thou wert ever engaged in our good & especially in that of the king (our eldest brother). It is scarcely proper, therefore, for me to grieve for thy illustrious self." Having slain those princes in the very sight of Radha's son, the son of Pandu uttered a terrible leonine roar.

http://www.sacred-texts.com/hin/m07/m07133.htm

Point: Bhima said Vikarna was ever engaged in their good especially of the king (their eldest brother [either Karna or Yudhishthira, both of them were kings] because he saved Karna's life twice), but that is considered a later interpolation as it has been removed by BORI Mahabharata.

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Later quote in Karna Parva:

"Thy heroic son Vikarna, deprived of steeds and weapons, stood, facing the foe, remembering the duties of Kshatriyas. Remembering the many foul wrongs inflicted upon him by Duryodhana & bearing in mind his own vow, Bhimasena hath slain him."

http://sacred-texts.com/hin/m08/m08005.htm

Analysis: Sanjaya claims that Vikarna had no weapons when he died.

• Described by Gandhari in Stri Parva

Quote:

There, O Madhava, my son Vikarna, applauded by the wise, lieth on the bare ground, slain by Bhima and mangled horribly! Deprived of life, O slayer of Madhu, Vikarna lieth in the midst of (slain) elephants like the moon in the autumnal sky surrounded by blue clouds. His broad palm, cased in leathern fence, and scarred by constant wielding of the bow, is pierced with difficulty by vultures desirous of feeding upon it. His helpless young wife, O Madhava, is continually endeavouring, without success, to drive away those vultures desirous of feeding on carrion. The youthful and brave and handsome Vikarna, O bull among men, brought up in luxury and deserving of every kind of weal, now sleepeth amid the dust, O Madhava! Though all his vital parts have been pierced with clothyard shafts and bearded arrows and nalikas, yet that beauty of person which was his hath not forsaken this best of the Bharatas.

Analysis: Gandhari (even though she was blindfolded) claimed that Vikarna's corpse was mangled and left to rot in the midst of dead elephants on the ground. She claims he was killed in an archery battle.

Source: http://sacred-texts.com/hin/m11/m11018.htm
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VIKARNA.

14th day.

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The seven sons of thine that were thus slain were Satrunjaya, and Satrusaha, and Chitra, and Chitrayudha, and Dridha, and Chitrasena and Vikarna. Amongst all thy sons thus slain, Vrikodara, the son of Pandu, grieved bitterly from sorrow for Vikarna who was dear to him.

https://sacred-texts.com/hin/m07/m07133.htm

14th night.

What Drona did (lighting lamp's);

"Indeed, all the troops, thus made radiant by the foot-soldiers with oil-fed lamps in their hands, looked beautiful like clouds in the nocturnal sky illumined by flashes of lightning. When the Kuru host had thus been illuminated, Drona, endued with the effulgence of fire, scorching everything around, looked radiant, O king, in his golden armour, like the midday sun of blazing ray. The light of those lamps began to be reflected from the golden ornaments, the bright cuirasses and bows, and the well-tempered weapons of the combatants."

{complete}

https://sacred-texts.com/hin/m07/m07159.htm

Suyodhana talked to Vikarna.

[quote]

Understanding the wishes of Drona who was bent on battle, Duryodhana, on that night addressing his obedient brothers, Vikarna and Chitrasena and Suparsva and Durdharsha and Dirghavahu, and said "Ye heroes of great valour, struggling with resolution, all of you protect Drona from the rear. The son of Hridika will protect his right and Sala his left." Saying this, thy son then urged forward placing them at the van.

https://sacred-texts.com/hin/m07/m07160.htm

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Conclusion: So all three descriptions differ in certain ways. All of them agree that Bhima killed Vikarna, two of them say that he was killed in an archery battle, one of them says that he was unarmed when he was slain.

Regarding the mention of vikarna on the 14th night it can be considered either a clerical error or a inaccuracy in mahabharat.