| Girl, Merc Storia|
| Max Stats
| Lv:100 HP:1736 ATK:1362 DEF:1297|
Lv:120 HP:2083 ATK:1634 DEF:1556 (Awoken)
| 30/1 |
| Main Skill (スキル)|
| 5x Stab attack|
| Sub Skill (子分スキル)|
| When attached to Main Card with an Attack Skill, Skill Efficacy +20% (If attached to Attacker and Merc Storia main, Skill Efficacy +35% instead)|
| Awoken Main Skill (スキル)|
| 5x Stab attack|
| Awoken Sub Skill (子分スキル)|
| When Main Card has Attack Skill, grants 35% Skill Boost (When Main Card is Merc Storia has Attack Skill, grants 35-40% Skill Boost)|
| Awoken Skill (覚醒スキル)|
| For every +1 AGI, grants +2% Skill Boost|
| S.Awoken Main Skill (スキル)|
| S.Awoken Sub Skill (子分スキル)|
| S.Awoken Skill (覚醒スキル)|
| Super Fusion (超合体)|
The Apprentice Boy & Girl's Courage!
Obtained from Merc Storia Collaboration event by clearing the Tier 3 Dragon Poker Event Quest, "True Malchut" once in Merc Storia.
Sietto has a pretty simple Main Skill in which she does 5x Stab attacks. There's also nothing else to her Main Skill, as it's just pure damage with no other effects. Awakening doesn't do much to improve this either, only increasing the damage to 1.00x at SL7, putting her on par with similar 5-hit attackers. That said, Awakening also gave Sietto a pretty good Attack boost, making her a good Red Stab card on par with any GOD-rarity card.
Offers a decent 20% Skill Boost to any card with an Attack Skill. The real kicker is if the Main Card is both Merc Storia and has an Attack Skill.
In that case, it grants an excellent 35% Skill Boost. However, because of those limitations, there's effectively very few cards you can use it on such as Gerald and Harushuto.
Sietto in particular makes a very good sub for Harushuto due to the matching Skill Icon.
Awakening greatly improves Sietto's Sub, making her an unconditional 35% Skill Boost to ANY Attack card! Much like before, Sietto still gives an extra boost (35-40%) to any Merc Storia Attackers like Orko and Seram. It's well worth Awakening Sietto just for this Sub Skill alone!
Sietto appears as one of the available units in Merc Storia.