Operation guide: SN-10

Operation

Guide

Story

The second and last operation of Nameless Ocean and the tenth and last main operation of Stultifera Navis, SN-10: Ceremonial Plaza takes the already difficult The Endspeaker to a whole new level, where it is now capable of evolving into no less than four phases with additional Regressed Sea Monster enemies to back it up:

• The Regressed Predator gives The Endspeaker a 50% chance to dodge Physical/Arts attacks when not being Stunned, Frozen, put to Sleep (where it can only be attacked by Blemishine and Blacknight's Slumberfoot), Bound, or Levitated.
• The Regressed Spewer causes The Endspeaker's ranged attacks to hit up to three targets within range at once.
• The Regressed Swarmcaller makes The Endspeaker immune to Slow and gives it Status Resistance, rendering Negative Statuses not as effective on it.
• The Regressed Reefbreaker gives The Endspeaker an ATK buff in each attack which decays over time if it does not attack for a while, and is the most dangerous Directed Evolution property.

The main difficulty of SN-10 is ensuring that The Endspeaker does not inherit Directed Evolution properties that could allow it to wreck the Operators or become more difficult to kill; should either happens, the operation is as good as lost. As such, Auto Deploying SN-10 is not advised since errors do frequently occur. Even the Global community regarded SN-10 as one of the most difficult operations in Arknights shortly after SN is released.

Strategy

Freeze and Burn

Squad composition

• Gnosis (Elite 2 Level 1+, Hypothermia Level 7+)
• Ifrit (Elite 1 Level 80+, Pyroclasm Level 7+)
• Mountain (Elite 1 Level 80+, Sweeping Stance Level 7+)
• Schwarz (Elite 2 Level 1+, Final Tactics Level 7+)
• 1 Centurion, Dreadnought, and Lord Guard
• 2 Wandering Medics
• 2 Pioneer Vanguards and 1 Charger Vanguard

This strategy is tested with the Operators in at least Elite 2 Level 40, but may work if the Operators are at least in Elite 1 Level 60 with some adjustments, and requires the use of the following Little Handy components:

• Survival Command - Melee (friendly melee units receive +40% healing)
• Hand of the Saint - Purification (Hands of the Saint remove Nethersea Brands)
• Interdiction - Technique (Negative Statuses on enemies last 80% longer)
• Brand Growth Inhibition (Nethersea Brand spread rate -50%)

Ifrit can be replaced by Corroserum; Mountain can be replaced by a second Centurion Guard including Popukar; Schwarz can be replaced by Fartooth with Feathershine Arrows, in which case the Dreadnought Guard is no longer necessary.

1. Deploy the Pioneer Vanguards on B5 and C5 facing right.
2. Deploy Gnosis on D5 facing down.
3. Deploy the strongest Wandering Medic on C2 facing right.
4. Deploy Schwarz on H9 facing left so that she has enough time to charge up Final Tactics.
5. Wait until The Endspeaker is at B10 and defeat it by helidropping the Charger Vanguard.
6. Deploy Ifrit on B2 facing right.
7. Wait until the Regressed Brandguider and Founder is at H7 and H3, respectively and activate Schwarz's Final Tactics to defeat the former and helidrop the Dreadnought Guard on H2 facing right to defeat the latter; even with the increased DEF, the Brandguider will quickly be defeated due to Final Tactics' damage and Armor Penetration Arrow's DEF debuff. Retreat Schwarz once both Regressed Sea Monsters are defeated.
8. Use a Hand of the Saint to clear the Nethersea Brands on H3 and H7 by deploying it on H2 facing right.
9. Replace the Pioneers with the Centurion (the one on B5) and Lord (the one on C5) Guards.
10. The Nethersea Brandguider from I10 would have its HP fallen below 50% while at B6; after it is defeated, use another Hand of the Saint to clear the Nethersea Brand there by deploying it on B10 facing left.
11. The Endspeaker would have Consumed the Regressed Brandguider's Remains after the Nethersea one is defeated, but this won't be an issue. Activate Gnosis' Hypothermia when The Endspeaker is in range, and watch as it is quickly taken out.
12. After The Endspeaker's second phase is taken out, wait until the Regressed Swarmcaller is at H3 and helidrop the Dreadnought at H2 facing right to defeat it and the Regressed Predator.
13. Whenever Mountain is blocking at least two Nethersea Predators from F1, use Hands of the Saint to Stun them, disabling their dodge and allowing Mountain to take them out.
14. Once The Endspeaker returns in its third phase, activate Gnosis' Hypothermia and the Centurion and Lord's skills to quickly take out the Endspeaker. Do this for the fourth phase as well.
15. Redeploy Schwarz on H9 facing left when the second Nethersea Swarmcaller from I10 reaches F10. Activate Final Tactics as soon as the Regressed Reefbreaker spawns and retreat her once it is defeated.
16. Helidrop the Dreadnought at H2 facing right to defeat the Regressed Spewer.