Duryodhana with his counsellor Purochana hatched a plan to burn the Pandavas alive at a lac palace Lakshagraha at Varnavrata that Duryodhana had built there (lacquer is highly inflammable). Thanks to prior notice from Vidura, the Pandavas managed to escape out from the palace with Bhima played a major role in carrying all five of them (Kunti and brothers) and escaping to safety. Bhima also barricaded the palace of Purochana and set fire to it, thereby ensuring Purochana became a victim of his own evil plot.