Aestus Estus: The Original Flame (原初の火, Gensho no Hi?, localized as "Aestus Estus: The Embryonic Flame") is a scarlet long sword and the the main weapon of Nero Ceasar. It is a hand-crafted crimson sword, made from meteor metal, brought with her when summoned under the Saber Class by a Master. It has the following inscription carved on it: regnum caelorum et gehenna (the kingdom of heaven and hell). She feels it is the ultimate instrument, and that muses would bow before the sound it makes.
Aestus Estus is also used in the summoning of Nero's Aestus Domus Aurea, in which she performs three powerful strikes and implants her sword into the ground thus activating it.
Saber(Nero) Sword Skills list
Rosa Ictus: Pavilion of Falling Flowers (花散る天幕, Hana Chiru Tenmaku?, localized as "Veil of Petals") - It is a sword technique that uses 30MP and it inflicts physical damage on an enemy.
Gladii Sanus Plausorum: Acclaim is the Equal of Weaponry (喝采は剣戟の如く, Kassai wa Kengeki no Gotoku?, localized as "Artillery Applause") - It is a sword technique that uses 40MP and it inflicts physical damage on an enemy.
Pari Tono Plausorum: Acclaim is the Equal of Roaring Thunder (喝采は万雷の如く, Kassai wa Banrai no Gotoku?, localized as "Thunderous Applause") - It is a sword technique that uses 60MP and it inflicts physical damage on an enemy. This Skill will replace Artillery Applause.
Imperial Privilege - Swordsmanship (剣術・皇帝特権, Kenjutsu - Kōtei Tokken?) - It strengthens the power of chain attacks.
Rose Ichthys - Burst Attack Skill - A curtain of falling flowers (Rose Ichthys) blasts a shockwave forward.
Fervence Ardeo - Close-Range attack Skill/class Skill (Saber) - Holy Fountain of Fire (Fervence Ardeo) - Slam your sword into the ground, causing an explosion.
Tres Fontaine Tempestes - Action Restriction Skill - Fountain of the Time-Weaving Saint - (Tres Fontaine Tempestes) - summon Rose thorns, which stun any enemy they strike.
Tres Fontaine Claudio - Area Attack Skill - Fountain of the Wound-Healing Saint (Tres Fontaine Claudio) - Whips a tornado or roses around you, damagin the enemy while also healing you.
Tres Fontain Ardent - Stengthening skill - fountain of the blazing Saint (Tres Fontain Ardent) - Breifly lights your blade on fire, adding the flame element and extra damage to attacks.
Gladiusanus Blauserum - Burst Attack skill - Applause is like Crashing Swords (Gladiusanus Blauserum) - A three-hit combo, which includes a flame shockwave.
