Death of Abhimanyu

Abhimanyu is another great warrior of Mahabharata, He is son of Arjuna and Subhadra and nephew of Lord Krishna. He defeated all primary warriors of Kauravas except Bhishma. He forced Karna to retreat 2 or 3 times. He defeated Drona, Kripa, Aswathama, Duryodhana, Salya. All primary warriors of  Kauravas are unable to defeat Abhimanyu. They defeated Abhimanyu by attacking together. Abhimanyu was weakened because he lost lot of blood. Abhimanyu still was not afraid when he lost his weapons and chariot and charioteer. He used his chariot wheel and attacked his enemies. He fought Dushasanas son with mace. Both Abhimanyu and Dushasanas son became unconscious but Dushasanas son got up first and him Abhimanyu's head with mace and killed him.

Karna a hero or villain

Karna is one of complex characters of Mahabharata. First he is seen coming and making fun of Arjuna at the Tournament of Kuru princes. When Bhima finds out that Karna is son of charioteer. Bhima insults him. But Karna hates Arjuna instead of Bhima. Then Duryodhana makes him King of Anga knowing that Karna is equivalent to Arjuna. Karna is always jealous of the fame and archery skills of Arjuna.

Karna joins Duryodhana and Sakuni in plotting against the pandavas. First Karna, sakuni, duryodhana join hands to kill pandavas in wax house.

Next Karna meets Arjuna disguised as brahmin at draupadi's swayamvar. He fights with Arjuna disguised and finds it unable to defeat Arjuna so he gives up the fighting. When it is later revealed that the disguised brahmin was Arjuna. Karna hates Arjuna more.

Next Karna insults draupadi by calling her a whore. It is Karna who instigates Dussasana to strip Draupadi of her clothes. Then Bhima vows to tear the chest of Dussasana and drink his blood.

Karna instigates duryodhana to make fun of pandavas when they are living in forest. They try to mock pandavas but they themselves are defeated by gandarvas. Karna runs away from battlefield leaving Duryodhana to gandarvas.

Karna is again defeated at Virat yudh by Arjuna and runs away from battle field. Arjuna defeats all wariors one by one in Virat yudh and atlast uses Sammohanastra as prince uttara is tired and makes all wariors including Karna unconscious.

Karna next urges Duryodhana not to make peace with Pandavas. He boasts that he can defeat all pandavas single handedly. Bhishma scolds for his boastfulness saying he lost to Arjuna many times.

Arjuna's death in hands of Babruvahana (his own son)

After mahabharatha war. Yudhistir performed aswamedha yaga. The sacrificial horse is to roam freely and anyone who captures it will be considered enemy of yudhistira and Arjuna had to defeat him. The horse goes to manipur. Babruvahana, the son of Arjuna and chitrangada and prince of manipur knowing that his father comes to receive him with due honours. But Arjuna gets angry and tells him "i came as a representative of Yudhistir. I am your enemy not your friend you should fight me".

Arjuna rebuked his son in bitter words. Ulupi amother wife of Arjuna and stepmother to Babruvahana comes to babruvahana and tells him to fight his father. Babruvahana fights with Arjuna. Both fight fiercely. Babruvahana shoots an arrow that kills Arjuna. Later babruvahana faints. Chitrangada comes to know that her husband is killed and her son is wounded. Chitrangada comes to battlefield and grieves Arjuna's death. Chitrangada blames Ulupi for making Babruvahana fight with Arjuna

Babruvahana regains consciousness and knowing that he killed his father prepares to commit suicide. But Ulupi comes and stops him and tells him "this is an illusion created by me, Arjuna cannot be defeated by Indra himself. Arjuna's death was caused by the curse of vasus as Arjuna has killed his grandfather Bhishma in unjust way"

Ulupi then revives Arjuna with gem that can revive dead people. Arjuna wakes up and is happy to see both Ulupi and Chitrangada and Ulupi explains about the cause for his death. Arjuna is happy with what Ulupi did. Babruvahana asks Arjuna to come to his palace but Arjuna says he has to go and takes leave of Ulupi, chitrangada and Babruvahana

Why Arjuna could not counter nagasthra

Why Arjuna sould not encounter Nagasthra is not that Arjuna did not have powerful asthra to counter it.
Actually he did not know that it was nagasthra as Karna himself did not know that snake aswasen entered the arrow. Aswasens mother was killed by Arjuna during the burning of Khandava forest. So he entered Karna's arrow to take revenge.So it was not the greatness of karna or inferiority of Arjuna here. Telugu and tamil movies have shown as if karna had nagasthra or something which is not true.