|Name in Japanese||竜尾|
|Appears In||Anime, Light Novels|
|Inventors||Snake of the Festival, Dantalion|
|Known Users||Yuji Sakai|
Dragon Tail (竜尾 Ryūbi ) is an Unrestricted Spell created by Dantalion that was given to Yuji Sakai when he merges with the Snake of the Festival. It allows him to manipulate his hair to be used offensively and defensively, allows him to manipulate the size of his hair, and allows him to make it as long as he wishes it to be. It is strong enough to tear a tall building in half or block Shana's flame blast.
Dragon Tail is used many times by Yuji before and during the Second Great War. It is also used by him to 'jump' by hitting it on the ground. Later, it is revealed in the novel that Yuji is unable to use it after Dantalion is killed in the explosion. This incident causes Yuji's long hair to be cut by Shana and to become the length of his hair before he contracted with the Snake of the Festival.
- In Shakugan no Shana Final Episode 24, it is not shown how Yuji's hair was cut off by Shana.
|Offensive||Aster • Danzai • Endan • Eternal Pitfall • Fist of Aten • Hien • Improvisational Poem of Slaughter • Inverna • Labyrinthos • Ra's Throwing Stone • Rainbow's Heaven Sword • Rubble Giant • Shinku • Stigma • Tōga|
|Defensive||Alcázar • Cradle Garden • Magnesia • Qadesh's Heart Chamber|
|Utility||Anti-Seal • City Devourer • Crypta • Fūzetsu • Humanize • Kaze no Tenrin • Long-distance Communication • Qadesh's Blood Seal • Shinpan • Tatsui no Gen • Yogasa|
|Miscellaneous||Purifying Flame • Psalm of the Grand Order • Tuning|
|Universal||Dragon Tail • Grammatica • Qadesh's Blood Pulse • Special Ability|
|Divine Summon||Saiki Reisō • Shōhi Ginsei • Tenpa Jōsai|
|Crystallization of Self-Research|
|Created by "Seeking Researcher" Dantalion|
|Excellent||Cantate Domino • Tyrant I/Tyrant II • Obelisk • Saishuku no Shadan • Kiken no Kentō (Kisan no Taiken)|
|Experiment||Combination Invincible Superhuman|
|Undesignated||Silver Sand Corridor • Conloquium • Dragon Tail|
|Related Articles||Iron Giant • Seireiden • The Silver • Statue of Pride • Trivia|