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Lost Arts (ロストアーツ) are a set of spells cast through particular quartz created during the Dark Ages that consist of multiple septium gemstones. Their enormous power combines the power of three different elements together. Thanks to similarities in orbal wavelengths, the Lost Arts can be cast inserting the corresponding quartz in the ARCUS. It can only be inserted in a element-locked slot that corresponds with one of the three elements of the quartz. While the Arts themselves are powerful, simply equipping the quartz grants large stat boosts.

In 영웅전설 섬의 궤적 II, Lost Arts can be found in the second half of the game by defeating Cryptids. Each Art can be used only once per battle and will consume 100% of its user's total EP. They return in 영웅전설 섬의 궤적 IV and 영웅전설 시작의 궤적 additionally granting large stat buffs. In Reverie's extra chapter, the lost arts can be upgraded to give larger stat boosts.

Lost Arts have an extremely long cast time. As such, it is considered advantageous to use them during Zero Arts turns, which also has the benefit of eliminating their enormous EP costs, or equipping the character with Cast quartz or using the Brave Order system to reduce casting time.

List of Lost Arts

영웅전설 섬의 궤적 II

	Quartz/Art	Effect	Cast/Delay	Class	Card
	Searing Sun Gem 焦陽珠 Sol Eruption ソル・イラプション	Attack - All - DEF/SPD-50% (5 turns) - Burn (200%) The sun burns all. Ignores element efficacy.	C: 3000 D: 3000	5S	The Sun
	Clear Moon Gem 玲月珠 Artemis' Tears アルテミスティア	Recovery - All - Recovers 200% HP Moon Goddess' power allows recovery beyond the body's limits.	C: 3000 D: 3000	—	The Moon
	Glimmering Star Gem 煌星珠 Grail Burst グラールバースト	Support - All - Accelerate - Attack twice in succession (Self) Manipulates space-time with the grail's power.	C: 0 D: 0	—	The Star
	Roaring Dragon Gem 吼龍珠 Tempestuous Roar テンペストロア	Support - All - CP+100 - Regen 30CP (3 turns) Roaring dragons in the earth veins grant power.	C: 3000 D: 3000	—	The Dragon
	Divine Salvation Gem 救聖珠 Lost Eden ロストオブエデン	Attack - All - STR/ATS-50% (5 turns) - Confuse (200%) Recreates gods' battle, bringing chaos. Ignores efficacy.	C: 3000 D: 3000	5S	The Holy

영웅전설 섬의 궤적 IV

	Quartz/Art	Effect	Cast/Delay	Class/Break	Card
	Frozen Epoch アイシクル・メテオ	Attack - All - Stats down (L) (4 turns) - HP+1000 - EP/DEF/ADF+100 Calls down a massive comet that traces a resplendent arc through the sky.		4S+/—	The Ice
	Leanan's Kiss リアノーン・キス	Support - All - Charm (200%) - CP+100 - Stats up (L) (3 turns) - EP/ATS/ADF+100 - Evade+10% Heals allies and charms an enemy with the kiss of the goddess of moon and wind.		—/—	The Moon
	Prominence Nova プロミネンス・ロア	Attack - All - Burn (200%) - Cancels stat boosts - STR/DEF+100 - MOV+10 - Accuracy+100% Summons a flaming phoenix that reduces that battlefield to ash.		4S/—	The Sun
	Grail Thelas グラール・セラス	Recovery - All - Cures ailments - Recovers 200% HP - HP+1000 - SPD/MOV +10 - Accuracy+100% Imbues allies with newfound energy using the power of the grail.		—/—	The Star
	Aeonian Emperor ロード・レグナリオン	Attack - All - STR/ATS+100 - SPD+10 - Evade+10% Summon a heavenly being to smite foes with its blade of Judgement.		5S/SS	The Heaven

영웅전설 시작의 궤적

	Quartz/Art	Effect	Cast/Delay	Class/Break	Card
	Frozen Epoch アイシクル・メテオ	Attack - All - Stats down (L) (4 turns) - HP+2500 - EP/DEF/ADF+250 Calls down a massive comet that traces a resplendent arc through the sky.		5S/—	The Ice
	Leanan's Kiss リアノーン・キス	Support - All - Charm (200%) - CP+100 - Stats up (L) - EP/ATS/ADF+250 - Evade+15% Heals allies and charms an enemy with the kiss of the goddess of moon and wind.		—/—	The Moon
	Prominence Nova プロミネンス・ロア	Attack - All - Burn (200%) - Cancels stat boosts - STR/DEF+250 - MOV+15 - Accuracy+100% Summons a flaming phoenix that reduces that battlefield to ash.		4S+/—	The Sun
	Grail Thelas グラール・セラス	Recovery - All - Cures ailments - Recovers 200% HP - HP+2500 - SPD/MOV +15 - Accuracy+100% Imbues allies with newfound energy using the power of the grail.		—/—	The Star
	Aeonian Emperor ロード・レグナリオン	Attack - All - HP+2500 - EP/DEF/ADF+250 Summon a heavenly being to smite foes with its blade of Judgement.		5S+/SS	The Hades
	Melville Ray メルヴィル・レイ	Attack - All - STR/ATS+250 - SPD+15 - Evade+15% A heavenly messenger descends to cleanse the earth of evil with its scorching rays. (‘舞い降りた天からの遣いが、邪悪が蔓延る地上を熱光線で浄イヒする。)		6S/—	The Heaven

Gallery

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  Leanan's Kiss
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  Leanan's Kiss
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  Prominence Nova
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  Prominence Nova
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  Pattern of Grail Burst

Trivia

• The 'The Dragon' and 'The Holy' cards from CS2 are replaced with 'The Ice' and 'The Heaven' in CS4, respectively. However the art remains mostly the same on each card with only the colors and background changing.
• 영웅전설 시작의 궤적 replaces 'The Heaven' with the 'The Hades'; however, the art, animations, and descriptions are completely identical. 'The Heaven' remains in game, but is given completely new art and animations.