Arena units

Backstab

Unit	Rarity	Cost	Speed	Skill	Source
Closer	6★	25	B	Poison	The Fantasica Chronicles 2

Critical Shot

Inflicts massive damage and ignores defense skills ( not yet confirmed if works )

Unit	Rarity	Cost	Speed	Skill	Source
Borage Swimsuit	6★	20	C	Poison	End of Summer Series
Evangeline	6★	30	C	Area Attack	Blood Guard Series
Jill o Lan	6★	15	C	Poison	All Hallow's Eve Series
Sheilah	6★	25	D	Slow Lv4 Attack Boost (Male) Lv2	Standard Card Packs
Ruse	5★	20	C	Poison	Halloween Fiesta
Apsara	5★	20	C	Knockback	The Fantasica Chronicles 2
Marissa	4★	15	D	Slow	End of Summer Series
Varme	4★	20	D	Area Attack	End of Summer Series
Trixy	4★	20	D	Area Attack	All Hallow's Eve Series
Oskar	4★	30	D	Slow	Blood Guard Series

Defense order

Unit	Rarity	Cost	Speed	Skill	Source
Urd	7★	30	C	Slow	The Fantasica Chronicles 2

Double Attack

Allows your unit to hit twice if triggered. However, each hit will only deal 80% of the damage he would otherwise deal with one hit.

Unit	Rarity	Cost	Speed	Skill	Source
Charles	6★	10	S		Standard Card Packs
Kreuz	5★	20	B	Poison	The Doomsday Tower
Thrain	5★	15	B		Standard Card Packs
Theodora	5★	25	B	Poison	The Color of Vengeance
Kuhl	4★	25	A	Poison	End of Summer Series
Mabel	4★	20	B	Poison	Arena Season 1
Orlando	4★	20	C	Slow	Heroes of Fantasica Series
Phyllis	4★	15	C	Knockback	The Fantasica Chronicles
Predica	4★	25	C	Slow	Kiss of Nature Series
Vilhelm	4★	25	C		Standard Card Packs
Tempus	4★	20	B	Knockback	Arena Season 3
Leevi	3★	10	A		Standard Card Packs

Drain Attack

Attack inflicts 1/2 damage, but unit is healed for that same amount.

Unit	Rarity	Cost	Speed	Skill	Source
Arana	6★	30	B	Slow	Kiss of Nature Series
Reimund	6★	30	B	Poison	Standard Card Packs
Lieri	6★	20	C	Knockback	The Elder Tree
Valeria	5★	25	B	Poison	Standard Card Packs
Louise Garou	5★	20	C	Knockback	All Hallow's Eve Series
Jiang Shi	4★	15	A	Poison	Monster Familiars 2 + Recruitment
Ronja	4★	20	C	Knockback	Standard Card Packs
The Count	4★	30	C	Knockback	All Hallow's Eve Series

Iron Wall

When attacked, will completely negate all damage caused by the attack. Any procing effect will still occur.

Unit	Rarity	Cost	Speed	Skill	Source
Aksana	6★	25	B	Slow	Standard Card Packs
Bajardo	6★	30	C	Knockback	Standard Card Packs
Vertex	6★	30	C	Slow	Sea Paradise + Recruitment
Ami	6★	20	B	Poison	Halloween Fiesta
Baldomero	6★	30	C	Knockback	Standard Card Packs
Senti	6★	25	C	Poison	Standard Card Packs
Aludra	5★	25	C	Knockback	Arena Season 2
Bernhard	5★	25	C		Standard Card Packs
Patrick	5★	25	C	Slow	Arena Season 1
Boreallis	4★	25	C	Knockback	Starfall Bluff
Zenobia	4★	25	C		Standard Card Packs
Emilia	4★	25	C	Slow	Halloween Fiesta
Defaite	4★	20	B	Poison	Arena Season 3
Haine	4★	20	B	Poison	The Elder Tree + Recruitment
Johann	3★	25	C		Standard Card Packs

Nerve Strike

Prevents a unit from using most skills for a set of number of turns

Unit	Rarity	Cost	Speed	Skill	Source
Klau	6★	30	B	Poison	The Fantasica Chronicles 2
Phileas	6★	20	B	Slow	Standard Card Packs
Karina	5★	15	D	Knockback	Blood Guard Series
Pasio	4★	15	D	Area Attack	The Fantasica Chronicles 2

Speed Order

Increases the speed of your entire team by a fixed amount.

Unit	Rarity	Cost	Speed	Skill	Source
Alt	6★	25	C	Poison	The Doomsday Tower Revelations
Coral	6★	20	C	Slow	Standard Card Packs
Demetria	6★	25	C	Slow	The Fantasica Chronicles
Eva	6★	20	C	Knockback	The Fantasica Chronicles
Gluck	6★	25	D	Slow Atk Boost (Female)	Standard Card Packs
Nunnally	6★	30	D	Area Attack	Arena Season 2
Ombre	6★	30	C	Knockback	The Gates of Darkness
Verlegen	6★	30	D	Knockback Atk Boost (Male)	The Arcane Atheneum
Juana	6★	30	D	Slow	Arena Season 3
Aqua	5★	20	D	Poison Atk Boost (Male)	The Arcane Atheneum
Fiato	5★	25	D	Poison Atk Boost (Male)	Standard Card Packs
Gilberta	5★	25	B	Slow	Standard Card Packs
Ignat	5★	25	B		Standard Card Packs
Lumiere	5★	25	D	Slow	Hero Points
Antony	4★	30	C		Standard Card Packs
Claire	4★	10	D	Area Attack	Heroes of Fantasica Series
Lyyli	4★	20	D	Slow	Standard Card Packs
Satellite	4★	25	D	Area Attack	Standard Card Packs
Leonor	4★	20	C	Slow	Halloween Fiesta
Leonor	4★	20	C	Slow	Halloween Fiesta
Odoacar	4★	15	B	Poison	Blood Guard Series
Cercle	4★	20	D	Area Attack	Blood Guard Series
Berthold	4★	10	D	Area Attack	Blood Guard Series
Fernando	3★	30	C		Standard Card Packs
Kirill	2★	25	C		Standard Card Packs

Triple Attack

Allows your unit to hit thrice. However, this also reduces the damage dealt by each hit. ( not yet confirmed how much )

Unit	Rarity	Cost	Speed	Skill	Source
Arcadia	6★	30	C	Knockback	Arena Season 1
Cardina	6★	30	B	Poison	The Symphony of Rapture
Margot_6	6★	25	B	Knockback	Sea Paradise
Ran	6★	25	B	Poison	Sea Paradise
Ficial	6★	25	C	Knockback	Challenger Packs
Trystis	6★	25	C	Poison	The Elder Tree + Recruitment
Shana	6★	25	C	Slow	Call of the Desert
Gust	6★	15	A		Standard Card Packs
Annette	5★	20	C	Knockback	The Fantasica Chronicles
Brenda	5★	25	D	Slow	Standard Card Packs
Evaldo	5★	25	C	Area Attack	The Symphony of Rapture
Isaac	5★	25	B	Poison	Arena Season 2
Lev	5★	25	A	Knockback	Standard Card Packs
Rupius	5★	20	B	Poison	Kiss of Nature Series
Diver	5★	20	C	Poison	Arena Season 3
Nail	5★	25	B	Slow	Arena Season 3
Teatro	5★	15	C	Knockback	Blood Guard Series

Quadra Attack

Allows your unit to hit four times. However, this also reduces the damage dealt by each hit. ( not yet confirmed how much )

Unit	Rarity	Cost	Speed	Skill	Source
Delfina	6★	30	C	Knockback	Standard Card Packs
Alhena	6★	25	C	Knockback	Starfall Bluff
Benedicta	6★	30	C	Slow	The Color of Vengeance
Chevalier	6★	25	B	Knockback	Challenger Packs
Rain	6★	20	C	Slow	Arena Season 3