"Although their magic is classified as darkness magic, they specialize in shadow spells, which are completely different from my darkness magic. Even mages stronger than them might be killed if they aren't careful.
"It is said that several hitman organizations of the Odin Kingdom are linked to the Shadow Tower. Fighting them head-on is fine, but it would be very terrifying if they mount a sneak attack on you.
"Their leader came to the Raging Flame Plane. He is a Heaven Rank powerhouse, but after coming to the Raging Flame Plane, he disappeared. No one, including the other Heaven Rank Powerhouses, could sense where he went.
"His level of concealment has reached an extremely frightening stage. If he launched an assassination, very few people in the Raging Flame Plane would be able to escape. Even those Heaven Rank powerhouses might not necessarily be able to survive.