Under Tides Rerun - Farming Guide and Event Operations

Event Currency:

• Event Currency only drops from Normal Event Stages.
• Total needed to clear shop: 3292

New Players:

• Total from Event Missions: 1080
• Total from First Clear rewards: 960 (520 from normal stages, 440 from EX stages)
• Remaining currency needed from normal Event stages: 1252
• Since currency drops at a rate of 1:1 for sanity spent,  1252 Sanity is needed on normal event Stages
• Sanity required for First clear of EX and Challenge mode: 240
• Total Sanity required to clear the Store: 1492
• One week of Annihilation will require around 125 Sanity.
• Total Sanity required is 1617
• The event runs for 10 days. The weekly mission pots give and extra 240 for a total of 2640.  2880 if you save from the week before.   
• Natural sanity generation (f2p) will easily be enough to clear the shop. 

Returning Players:

• Total currency from Event Missions that award Intelligence Certs or Yellow Certs (SV-5, SV-6, SV-7, SV-8, SV-9, SV-EX-8 CM), also Missions that you will automatically achieve by clearing event stages: 500
• Currency needed from normal Event stages: 2792
• Since currency drops at a rate of 1:1 for sanity spent,  2792 Sanity is needed on normal event Stages
• Sanity required for clearing WD-8-CM: 20
• Total Sanity required to clear the Store: 2812
• One week of Annihilation will require around 125 Sanity.
• Total Sanity required is 2937
• The event runs for 10 days. The weekly mission pots give and extra 240 for a total of 2640.  2880 if you save from the week before.
• Natural sanity generation (F2P) will not be quite enough to clear the shop unless more missions are completed. 
• Additional missions (stages SV-1 to SV-4) give an extra 140 and should be done first.  Stages SV-EX-1 through SV-EX-8 give 380.  
• There IS ENOUGH Natural sanity generation (F2P) including ALL MISSIONS, but players should complete the minimum necessary if they want to clear the shop.

T3 Materials Farmable From Event Stages

• SV-9: Integrated Device
• SV-8: Crystalline Component
• SV-7: Orirock Cluster

Farming Efficiencies (source): Device > Crystal > Rocks.  Devices are by far the most efficient material to farm and they do not show up again in an event-stage-farm event in the foreseeable future (though they will show up at a slightly higher efficiency in An Obscure Wanderer).  

To see how many of these Materials your Operators might need, check the material pages or the Planner here:

This Page shows the Operations available during the [Under Tides]  Event. 

Trust bonus on Event stages

New Enemies and Mechanic

Challenge Conditions:

• SV-EX-1: Increase all enemies' ATK and Max HP
• SV-EX-2: Slower DP regeneration speed
• SV-EX-3: Lower all Allies' Max HP
• SV-EX-4: 8 tiles forbid deployment

• SV-EX-5: Increase the ATK and Neural Damage of [Nutritious Harvester]
• SV-EX-6: Greatly increase the DEF and Max HP of [Nutritious Harvester]
• SV-EX-7: Increase the attack range and Max HP of [First Talker]
• SV-EX-8: Remove two [Emergency Aid Facility]