Explore the Mysteries of the Yggdrasil and the Runes with King Thor (2019) Comics - Available for Download
Rune King Thor is an all powerful version of Thor who is able to tap into the power of the Odinforce, an infinite source of energy. In the comics, to become the Rune King, Thor had to go on a journey that involved three steps: Sacrifice, gaining knowledge of the past, and gaining knowledge of ancient runes. YouTube user ComicsExplained breaks this all down really well if you're interested for the long version.
Thor would be too powerful and would make the other heros look useless and weak. In the comic Rune King Thor Beheaded Loki and prevented him from dieing due to him having the full knowledge and power of rune magic.