Dossoles Holiday- Event Operations and Farming Guide

Event Currency:

• Event Currency only drops from Normal Event Stages in the form of Stickers that can be traded in.
• Total needed to clear shop: 15007 (not including Furniture Parts)
• Total from Event Missions: 2850
• Total from First Clear rewards: 1539 (585  from normal Stages, 510  from EX stages, 300 from S stages 144 from MO Stages)
• Remaining currency needed from normal Event stages: 10,618
• Currency from stickers drops at a guaranteed rate of 1:1 for sanity spent.  Also, additional stickers can drop on stages and be traded in for currency. On average, those extra drops provide about 1 currency per 1 sanity spent (I've also seen some estimates that the extra drops provide 1.1 currency per 1 sanity spent.  I'll use the 1:1 ratio estimate in these calculations for a safer, more conservative estimate)   Thus, on overage, 2 currency is gained for every 1 sanity spend. Thus, approx. 5309 additional sanity on event stages is needed.
• Sanity required for First clear of EX, S, and MO, and Challenge modes: 489
• Total Sanity + Sticker drop currency required to clear the Store: 5798
• Two weeks of Annihilation will require around 250 Sanity.
• Total Sanity + sticker drop currency required is 6048
• The event runs for 3 weeks, so natural Sanity regen supplies 5040.  The weekly mission Top pots give an extra 200 per week, for a total of 600,( or 800 if you saved from the week before).  
• The Log-in event that runs during this time provides 2 additional Top Pots for a total of 200.
• Total possible of f2p natural regen is about 5840.
• F2P players MIGHT NOT have enough natural sanity to clear the shop.  It will depend on personal luck with sticker drops.  Pots should be saved and currency spent wisely
• If players were able to do the web-event before the event started, they could have received more sanity pots.  Depending on which reward set you got, it could be up to 7 small sanity pots (giving 420 more sanity) or 1 large sanity pots (giving 100 more sanity).  
• The monthly pack provides an additional 1260 sanity over 3 weeks, for a total of 6900, so monthly pass players should be able to clear (depending on personal luck).
• Shop Efficiencies: (Source)

T3 Materials Farmable From Event Stages

No development materials drop from event stages, but the following T3 materials have infinite quantity that can be purchased from the shop with event currency:

This Page shows the Operations available during the [Dossoles Holiday]  Event. 

Event stages drop Stickers that can be used for buffs during combat and can be turned in for event currency.  More info on stickers and their use can be found here:

Trust bonus on Event stages

New Enemies and Mechanic

Translation Credit: Noël#4395

Challenge Conditions:

• DH-EX-1: Enemy casters have longer attack range
• DH-EX-2: Harbour Bluejackets have more HP and ATK
• DH-EX-3: 3 tiles are banned and Kites attack faster
• DH-EX-4: Defender deploy cost x4
• DH-EX-5: Explode boats do more explosion damage
• DH-EX-6: Operators take more continous Erosion damage while submerged
• DH-EX-7: 6 tiles are banned
• DH-EX-8: Operators have halved max HP

There are 4 secret stages with the following unlock requirements and challenge modes.  The image shown is unlocked as well

DH-S-1:

• Unlock: Gain 5 of Ch'en's mission currency and collect the milestone reward.
• Challenge Condition: Ally Block -1
• Photo: 

DH-S-2

• Unlock: Gain 24 of Ch'en's mission currency and collect the milestone reward.
• Challenge: Buffed enemies
• Photo: 

DH-S-3

• Unlock: Gain 39 of Ch'en's mission currency and collect the milestone reward.
• Challenge: Waterborne Platforms can't be used
• Photo: 

DH-S-4

• Unlock: Gain 66 of Ch'en's mission currency and collect the milestone reward.
• Challenge: Harbour Bluejackets have more HP and no longer lose HP over time while submerged
• Photo: