Dark Dragon Reise

Dark Dragon Reise is a powerful ancient dragon and protector of the sword of the Demon Lord. Reise has the rare ability to transform into a human, which they use against the other humans to sow discord and steal military intelligence.

Monster file
A dark dragon who protects the Sword of the Demon Lord. One of the eldest and strongest of the already powerful dragons. Even without transforming, this dragon already has a humanoid form. as a result, they take unusual battle tactics compared with most dragons, using martial arts and magic. Since Reise was essentially sealed away with the Sword of the Demon Lord in a separate dimension, their level and stats are slightly lower than those of the other ancient dragons. However, they have several skills that would be effective even on gods; thus their total battle capability is no less than the others'. A legendary-class monster, assumed untouchable by humans.

Trivia

 * Riese has revealed that he is one of the many genetic experiments created by Potimas Harrifenas during his, Güliedistodiez, Shiraori and Ariel's meeting to discuss the state of the world and the solution to fix it.
 * Due to Potimas's using his genetics for his experiments, he could technically be considered Ariel's brother. Causing him to fondly call her "Nee-san" as he considers her his older sister.