Asgore Dreemurr is the tyrant king of the underground and monsterkind for tens of thousands of years, the war was caused when the monster prince Asriel was slaughtered by humans in a misunderstanding. Asgore has a deep hatred of the human race and the ex monster queen Toriel who fled after his race was sealed under MT.Ebott under a powerful magic barrier, now crime and death and poverty is all common in the underground but he remains silent and enclosed to drown in his rage and grief.