Leo Ilias is the latest Leo-sign Saint to join the game. From what we've seen so far on the test server, he's a DPS with the ability to perform a Summon that changes his playstyle in battle. We haven't seen much yet, and it's quite possible that his skill set will change over time, but in keeping with the Leo tradition, he's a DPS that we expect to be competent.
Leo Ilias
Base Stats
HP 17290
P.ATK 3139
C.ATK 0
P.DEF 507
C.DEF 475
Speed 288
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Skill Build
Skill 1 
Skill 2 
Skill 3 
Skill 4 Min
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Leo Ilias skill level table assumes the character is at level 80, with the 8th sense unlocked and, if available, the Awakened Cloth activated.
Skill Descriptions
Skill 1
Lion’s Scythe
Deals 130% P.DMG to a single enemy. If Archos is currently detached, this attack deals additional P.DMG equal to 15% of the target's current HP (capped at 300% of Illias's P.Atk). If Archos has returned, this attack gains 20% Life Steal and grants Illias 2 stacks of [Battle Spirit].
Skill 2
Lightining Plasma
Deals 5 segments of damage to a single enemy, each dealing 180% P.DMG. Archos Detached: Crit Rate increases by 30%. Each segment has a 70% base chance to inflict 1 stack of [Deterrence]. Archos Returned: Gains 50% Life Steal and grants 3 stacks of [Battle Spirit]. [Deterrence]: Reduces Dual Defense by 10% per stack. Max 5 stacks, lasts 2 rounds (can be purified). At 5 stacks, the target is marked as [Prey]. [Prey]: If Illias is attacked by a [Prey] target during this round, he counters with a Basic Attack (each unit can be marked once per round; max 2 counters per round). [Battle Spirit]: Increases P.Atk by 5% and Crit Rate by 3% per stack. Max 5 stacks. Cannot be dispelled, lasts 2 rounds.
Skill 3
Lion’s Battle Spirit
While Illias is on the field, Archos provides permanent protection (Archos cannot be targeted). At the start of a round, if Illias’s HP is above 50%, Archos detaches. Illias’s Crit Rate increases by 30%, and he deals 30% more damage to targets affected by [Deterrence]. At the start of a round, if Illias’s HP is below 50%, Archos returns. Illias gains a 35% chance to dodge attacks. While carrying [Battle Spirit], his Life Steal increases by 30%.
Skill 4
Eighth Sense Realm
Return Transformation: When Archos moves from [Detached] to [Returned], Illias is immediately purified. If Illias fails to dodge an attack this round, Archos swallows 40% of that damage. This stored damage is converted into an equal amount of HP for Illias after the enemy's action ends (can stack, lasts one round, max 2 triggers). Detachment Transformation: When Archos moves from Returned to Detached, 1 stack of [Deterrence] is immediately applied to all enemies. Furthermore, when Illias attacks a deterred target, each segment of damage carries True Damage equal to 15% of the target's current HP (capped at 300% P.Atk, triggers up to twice per round).