<P> The human eventually leaves Toriel to search for Asgore 's castle , which contains the path ( blocked by the barrier ) leading to the surface world . Along the way , the human encounters several monsters , including : the skeletons Sans and Papyrus , two brothers who act as sentries for the Underground ; Undyne , the head of the royal guard ; Alphys , the kingdom 's royal scientist ; and Mettaton , a robotic television host Alphys built . Some of them are fought , with the human having to choose whether to kill them or to show mercy ; should the human spare them , they become friends . During their travels , the human learns the details and the cause of the war between humans and monsters , as well as the backstory of Asriel , the son of Asgore and Toriel . Asriel had befriended a human child named Chara who fell into the Underground and was adopted by Asgore and Toriel . One day , Chara fatally poisoned themself by drinking a tisane made from poisonous buttercup flowers , in a bid to have themself absorbed by Asriel in order to fulfill their plan of freeing the monsters by collecting six additional souls from the surface , which would then be used with Chara 's soul to break the barrier . Asriel absorbed Chara 's soul , and crossed the barrier , but from there refused to carry out the plan any further , instead deciding to attempt to return Chara 's body to their home village . He was killed by humans who thought he killed Chara , as he refused to defend himself out of his pacifistic ideology . With both of his children dead , Asgore declared another war on humanity , and continued Chara 's plan , seeking to break the barrier by killing any human who falls into the Underground to collect seven human souls , of which he currently has six . </P>
<P> The human eventually leaves Toriel to search for Asgore 's castle , which contains the path ( blocked by the barrier ) leading to the surface world . Along the way , the human encounters several monsters , including : the skeletons Sans and Papyrus , two brothers who act as sentries for the Underground ; Undyne , the head of the royal guard ; Alphys , the kingdom 's royal scientist ; and Mettaton , a robotic television host Alphys built . Some of them are fought , with the human having to choose whether to kill them or to show mercy ; should the human spare them , they become friends . During their travels , the human learns the details and the cause of the war between humans and monsters , as well as the backstory of Asriel , the son of Asgore and Toriel . Asriel had befriended a human child named Chara who fell into the Underground and was adopted by Asgore and Toriel . One day , Chara fatally poisoned themself by drinking a tisane made from poisonous buttercup flowers , in a bid to have themself absorbed by Asriel in order to fulfill their plan of freeing the monsters by collecting six additional souls from the surface , which would then be used with Chara 's soul to break the barrier . Asriel absorbed Chara 's soul , and crossed the barrier , but from there refused to carry out the plan any further , instead deciding to attempt to return Chara 's body to their home village . He was killed by humans who thought he killed Chara , as he refused to defend himself out of his pacifistic ideology . With both of his children dead , Asgore declared another war on humanity , and continued Chara 's plan , seeking to break the barrier by killing any human who falls into the Underground to collect seven human souls , of which he currently has six . </P>
in the game undertale who was mettaton 's creator
in the game undertale who was mettaton 's creator
Alphys , the kingdom 's royal scientist
Alphys , the kingdom 's royal scientist