The future doesn't belong to you!

For those who have not completed Xenoblade Chronicles, this page or section may contain spoilers regarding the plot. Discretion is advised.

The Mysterious Telethia (Japanese: 謎のテレシア, Nazo no Tereshia) is a quest exclusive boss in Xenoblade Chronicles. It is a Gigas-type member of the Telethia family, and appears at level 80 near the Lakeside in Makna Forest during the Melancholy Tyrea Surprise Quest. It must be defeated to complete the Melancholy Tyrea surprise quest. Although the Mysterious Telethia drops no treasure (like any bosses), it does carry crystals, which can be obtained by using Riki's Yoink! ability. At the end of the battle, it is revealed to be Yumea.



Art Attribute Multiplier Hits Range Effect Knockback Blowdown/Daze
Super Nova VIITalent (Ether)1.0 – 1.254Frontal ArcBind--
Ultimate Cannon IXTalent (Ether)3.0 – 3.21Frontal Line-Yes (1)-
Soul ReadStatus--SelfPhysical Evasion Up--
Talent AbsorbStatus--SingleTalent Absorb--
Sleep SpinPhysical2.3 – 2.51Frontal ArcSleep--
Sleep BulletEther2.05 – 2.251SingleSleep--


Break 70% Lock-On 0% Physical Def. ▼ 70% Agility ▼ 0%
Topple 0% Bind 0% Ether Def. ▼ 70% Aura Seal 0%
Daze 0% Paralysis 70% Strength ▼ 0% Arts Seal 70%
Sleep 70% Slow 100% Ether ▼ 0% Death 100%

Stealable items

Telethia Crystals
First Attack Plus V / Auto-Heal Up V 0%
First Attack Plus V / Topple Resist V 0%