to the head of monsters, and this largely disables their movement. It's used humorously in various scenes.
I'm wondering what is significant about the character 定 in particular.
Question: Why does 定 disable the monsters' movement in Monster Hunt?
Among the definitions at dict.cn for 定, we have "to set" and "to fix". It's possible it's used as short for 固定, which has "immobilization" among its definitions. Although, I'm just guessing here, and I feel like there is more to it, possibly even something historical.