'Immortal' friendship

From few days I have been reading characters of great Hindu Epic Mahabharata . It is source to learn Mores, principles, ethics and ethos, strategy making and even craftiness and connivance to win a war.
A lot to learn from this ,but character which comes out whose efficacy has impacted my mind in mystical way is the eternal character of immortal Karna. Let it be his generosity or power of divine Earrings and protective armor , his charisma or his strength he was just the Hero of this epic Mahabharata. Among all these one thing is worth mentioning, his friendship towards Duryodhana – the villain of the whole story. Although he was against the Dharma(Conscience) Karna was beholden to him via his friendship for the help he got in the hastinapur’s skill show arranged by Drona, where Karna was refused to participate because he was not prince but a Soot Pootra(Son of charioteer ) Duryodhana immediately offered him Ang province to make him prince of it,And thus he became Angraj Karna to participate in the show. Abided by this help Karna pledged to help Duryodhana whenever he needs it.
When lord Krishna went to Karna for persuading him to not to be on the side of Kauravas in the battle of Kurukshetra by making him aware that ultimately Karna would be king of hastinapur after victory of pandavas in the battle, as Karna was the elder brother of Pandvas and son of Kunti. But even after this alluring offer by Krishna he was staid and stoic towards it. He supposed his first and foremost job is to help his friend Duryodhana. He followed the rules by heart as a warrior , as son , as friend and even as chief of the Kaurava’s army which he took after the death of Drona where he put down his bow from which death of Arjuna was imminent had there not been the sunset.
It was mentioned by the scholars that , Karna and Duryochana were so close friends that Duryodhana literally wept on the death of Karna, which he did not do on the death of his 99 brother who lost their lives in the battle against Pandavas. Duryodhana always knew the fact that Only Karna can manage to destroy Arjun because he was the only man superior to Arjun at times, so he kept the battle on even after losing great warriors like Drona , Bhishma and Dushasan. Krana finally went to the battle field and fought bravely against Arjun but alas Arjun managed to kill Karna by trickery. Karna did all this to just because of friendship. He could have been fled away from this but didn’t because he promised Duryodhana to help him out and he was indeed a great warrior even greater than Arjun .
I bow to thee to this friendship between Karna and Duryodhana which is immortal as Karna in our heart s even today. Hail Karna !!