Gáe Dearg

is a demonic scarlet spear two meters long that renders magical enhancements and projections useless by severing all ties with magical energy. It was passed down to the Heroic Spirit Diarmuid Ua Duibhne, given as a gift from his foster father, the druid , and he normally keeps it wrapped in a talisman cloth to seal its abilities and keep it from revealing his identity. "Dearg" means red. 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 affect whatever it strikes.
Dearg.gif|Saber's expected outcome and the reality of Gáe Dearg piercing her armor.
Gae Dearg nullifyng Invisible Air.gif|Gae Dearg nullifying Invisible Air revealing Excalibur.
Diarmuid's Gáe Dearg slices through Berserker's Knight of Owner Pole.gif|Gáe Dearg slices through Berserker's Knight of Owner Pole
Diarmuid damaging Prelati's spellbook with Gae Dearg.gif|Lancer damaging Prelati's spellbook.
Lancer destroying Berserker's plane.gif|Lancer destroying Berserker's Knight of Owner enhanced plane.
The spear will pierce directly through any projection made of magical energy, such as Saber's summoned armor; Bounded Fields, such as Invisible Air, will have small fissures created that slowly chip away at them with each strike; any weapon that is magically enhanced, such as those enhanced by Knight of Owner, will have its enhancements and ability boosts rendered useless when struck by the spear; and any item that acts as a magical energy source, such as Prelati's Spellbook, will have all to its recipients connections severed.
The nullification is not strong enough to cancel or break the source of the magecraft, making it unable to sever completed magecraft such as contracts exchanged in the past or curses in the way that Rule Breaker can completely nullify them. The spear is not suitable for defensive usage because its effects only last while the tip of Gáe Dearg is in contact with the object, and it allows the object to function as normal after the spear is lifted away.Fate/Grand Order material II - Diarmuid Ua Duibhne, p.298-305 While it is not a weapon one can pride on its destructive power, it can be considered a threatening "Anti-Noble Phantasm" and "Noble Phantasm killer" to those that find pride in the power of their armaments, forcing them to defend only by physical means; however, the effect of this demonic spear alone cannot destroy Noble Phantasms.
 Although it is just a spear to one who does not use magic, it is unlikely for one to not use something magical in a battle between Servants. While not really flashy, it is a really useful Noble Phantasm.
When going into life-threatening adventures, Diarmuid would carry Gáe Dearg along with the demonic sword Moralltach. On the request of his leader Fionn mac Cumhaill to instigate the "Three Brave Men of the Sea" and to battle the "Immortal Ferocious Poison Dog", and in the interception of the "Hand Mill Flying in the Sky" spurred on by Fionn's wet nursing witch, Diarmuid was able to demonstrate the spear's full might.
==Notes==
*On "Gáe Dearg, Crimson Rose of Exorcism", there are ᚷ ᛒ ᚾ ᛊ ᛏ. These runes are Gyfu, in this case mainly meaning Spear; Berkanan, meaning Birch; Nauðr, meaning Need, Distress or Hardship; Sol, meaning Sun; 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