 Key elements in the game are negotiation with and the fusion and creation of demons . Encountered in battle , demons can be talked with and negotiated into running from the battle , giving money or items , or joining the player 's party . If the negotiation fails , the demon will attack . Once a demon is won over , they are given a loyalty meter which is influenced by the player 's actions . If the demon is treated well and performs actions in battle it approves of , its loyalty will increase . If the opposite occurs , the demon will begin to disobey the protagonist , then leave . Demons can be fused together at a special location in the game called the Hotel <unk> , where fusions are supervised by the NPC Dr. Victor . Demon fusion is governed by a comparability system , with more favorable fusions emerging from better demon compatibility . Demons can also be fused with weapons to grant stat boosts , and after a certain point in the game artificial demons called <unk> can be used and strengthened through repeated fusions . 
