Gáe Buidhe

is a cursed spear 1.4 meters long that inflicts wounds that cannot be healed naturally or with magecraft. It was a gift given to Diarmuid Ua Duibhne by Manannán, the king of fairies, and he normally keeps it wrapped in a talisman cloth to seal its abilities and keep it from revealing his identity.
Unlike most other Noble Phantasms, the abilities of the spear are passive in nature. It does not require its name to be called upon in order to be utilized, allowing it to instantly actualize its curse of mortality upon striking the enemy. The spear lowers the opponent's maximum health limit, thus limiting healing and regeneration abilities to the point where the opponent received the injury. When Saber receives a light wound on her left arm that severs her tendons, Irisviel is unable to heal it with magecraft due to her being considered in a state of full health. It is a dangerous spear, but only its owner, Diarmuid, can stand up to the tip of Gáe Buidhe and stay uninjured while stepping into it.
The effect cannot be normally dispelled, and canceling the curse requires the destruction of the spear or the death of its owner. While Saber's wound is shallow, it seals off her ability to use Excalibur properly until Lancer forcefully destroys the lance on his own. The enormous curse contained within gushes out in a whirlwind, scattering into nothingness and allowing Saber to return to full health instantly. It is just a spear if used in a short-term decisive battle, but thinking based on the assumption that one can fight the same opponent several times over a long period of time, it can be something like a really effective body blow that slowly yet surely works. If the target is not a Servant, it can be expected that the affected wound is fatal as one will bleed to death over time. Like Gáe Dearg, although it is lacking in flashiness, it is a really useful Noble Phantasm that is very user-friendly.Fate/Grand Order material II - Diarmuid Ua Duibhne, p.298-305
When danger was scarce, Diarmuid would carry Gáe Buidhe along with the demonic sword Beagalltach.Fate/Grand Order - Profile of Diarmuid Ua Duibhne (Saber) In his last moments where he was battling the Demon Boar, a battle brought upon by a curse, he brought with him Gáe Buidhe instead of Gáe Dearg, which proved to be his fatal mistake.
==Notes==
*On "Gáe Buidhe, Yellow Rose of Mortality", there are ᚷ ᛒ ᛞ ᚺ ᛏ. These runes are Gyfu, in this case mainly meaning Spear; Berkanan, meaning Birch; Dæg, meaning Day; Haglaz, meaning Hail; and Tiwaz, translating into "Týr", the god.
==References==
Category:Noble Phantasms
Category:Anti-Unit Noble Phantasms
Category:B rank Noble Phantasms
Category:B+ rank Noble Phantasms
Category:Spears
Category:Noble Phantasms introduced in Fate/Zero
Category:Noble Phantasms of Diarmuid Ua Duibhne
Category:Noble Phantasms of Manannán mac Lir