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EN Heart of Surging Flame banner.png

Heart of Surging Flame is the second major event and Side Story in Arknights.

The event is divided into three parts in the Global server.

Release date
Global April 15, 2020 ~ April 29, 2020
TW September 30, 2020~ October 14, 2020

Operators

Headhunting

The Forging Steel headhunting banner is featured.

Obsidian Festival Bracelet

Collect Obsidian Festival Bracelet.png Obsidian Festival Bracelet to claim the following rewards by completing Daily and Event Missions.

300 Obsidian Festival Bracelet.png
Integrated Device.png
3
600 Obsidian Festival Bracelet.png
Aketon.png
5
900 Obsidian Festival Bracelet.png
Pure Gold.png
40
1200 Obsidian Festival Bracelet.png
SUM019.ver
1500 Obsidian Festival Bracelet.png
Furniture Part.png
200
1800 Obsidian Festival Bracelet.png
Epic Supporter Token
2
2100 Obsidian Festival Bracelet.png
Skill Summary - 2.png
30
2400 Obsidian Festival Bracelet.png
Strategic Battle Record.png
25
2700 Obsidian Festival Bracelet.png
Recruitment Permit.png
5
3000 Obsidian Festival Bracelet.png
Epic Supporter Token
2
3300 Obsidian Festival Bracelet.png
Beach Guard GT.001
3600 Obsidian Festival Bracelet.png
LMD.png
30K
3900 Obsidian Festival Bracelet.png
Top Emergency Sanity Potion.png
1
4200 Obsidian Festival Bracelet.png
Chip Catalyst.png
1
4500 Obsidian Festival Bracelet.png
Plaque - Whole Day.png

Each excess Obsidian Festival Bracelet will be converted into 20 LMD icon.png (given as an in-game mail) at the end of the event.

Missions

Daily

During the event, the rewards for Daily Missions are changed to the following:

#0
LMD.png
500
#1
Drill Battle Record.png
3
#2
LMD.png
1K
Skill Summary - 1.png
2
#3
Obsidian Festival Bracelet.png
40
#4
Recruitment Permit.png
1
Drill Battle Record.png
5
#5
LMD.png
2K
Carbon Stick.png
3
#6
Obsidian Festival Bracelet.png
50
#7
Expedited Plan.png
1
Frontline Battle Record.png
5
#8
Orundum.png
100
#9
Shop Voucher.png
5
Furniture Part.png
600
#10
Obsidian Festival Bracelet.png
60

Event

Mission Reward
Spend a total of 800 Sanity icon.png 50 Obsidian Festival Bracelet.png
Spend a total of 1600 Sanity icon.png 100 Obsidian Festival Bracelet.png
Spend a total of 2400 Sanity icon.png 150 Obsidian Festival Bracelet.png
Gain a total of 50000 Operator EXP through training 50 Obsidian Festival Bracelet.png
Gain a total of 100000 Operator EXP through training 100 Obsidian Festival Bracelet.png
Gain a total of 150000 Operator EXP through training 150 Obsidian Festival Bracelet.png
Spend a total of 80000 LMD icon.png to train or promote Operators 50 Obsidian Festival Bracelet.png
Spend a total of 160000 LMD icon.png to train or promote Operators 100 Obsidian Festival Bracelet.png
Spend a total of 240000 LMD icon.png to train or promote Operators 150 Obsidian Festival Bracelet.png
Spend a total of 1000 Credit icon.png at the Credit Store 50 Obsidian Festival Bracelet.png
Spend a total of 2000 Credit icon.png at the Credit Store 100 Obsidian Festival Bracelet.png
Spend a total of 3000 Credit icon.png at the Credit Store 150 Obsidian Festival Bracelet.png
Send 6 Clues to friends 50 Obsidian Festival Bracelet.png
Send 12 Clues to friends 100 Obsidian Festival Bracelet.png
Send 18 Clues to friends 150 Obsidian Festival Bracelet.png
Defeat a total of 1000 enemies in Annihilation stages 50 Obsidian Festival Bracelet.png
Defeat a total of 2000 enemies in Annihilation stages 100 Obsidian Festival Bracelet.png
Defeat a total of 3000 enemies in Annihilation stages 150 Obsidian Festival Bracelet.png
Clear any stage a total of 40 times 50 Obsidian Festival Bracelet.png
Clear any stage a total of 80 times 100 Obsidian Festival Bracelet.png
Clear any stage a total of 120 times 150 Obsidian Festival Bracelet.png
Defeat a total of 3000 enemies 50 Obsidian Festival Bracelet.png
Defeat a total of 6000 enemies 100 Obsidian Festival Bracelet.png
Defeat a total of 10000 enemies 150 Obsidian Festival Bracelet.png
Use Recruitment 10 times in total 50 Obsidian Festival Bracelet.png
Use Recruitment 25 times in total 100 Obsidian Festival Bracelet.png
Use Recruitment 40 times in total 150 Obsidian Festival Bracelet.png
Assign 100 Operators to restore Morale in the Dormitory 50 Obsidian Festival Bracelet.png
Assign 200 Operators to restore Morale in the Dormitory 100 Obsidian Festival Bracelet.png
Assign 300 Operators to restore Morale in the Dormitory 150 Obsidian Festival Bracelet.png
Complete 50 orders 50 Obsidian Festival Bracelet.png
Complete 100 orders 100 Obsidian Festival Bracelet.png
Complete 150 orders 150 Obsidian Festival Bracelet.png
Produce 100 Pure Gold in the Factory 50 Obsidian Festival Bracelet.png
Produce 200 Pure Gold in the Factory 100 Obsidian Festival Bracelet.png
Produce 300 Pure Gold in the Factory 150 Obsidian Festival Bracelet.png
Conduct 1 Clue Exchange 50 Obsidian Festival Bracelet.png
Conduct 2 Clue Exchanges 100 Obsidian Festival Bracelet.png
Conduct 3 Clue Exchanges 150 Obsidian Festival Bracelet.png

Release date
CN August 27, 2019 ~ September 10, 2019 (as the Summer 2019 event)
Record Restoration: August 26, 2021
Global April 29, 2020 ~ May 13, 2020
Record Restoration: March 1, 2022
TW October 14, 2020 ~ October 27, 2020
Record Restoration: June 1, 2022

Operations

Clear 1-10 to access OF operations.

Main Stage
Fairground
Extra Show

Extra Show operations are available in the second week of Part 2.

All OF operations are worth 29 Originite Prime icon.png.

Operators

Ceylon is awarded when OF-4 is cleared for the first time.

The following Operators gain 50% extra Trust (except from Annihilation):

Headhunting

The Summer Guardians headhunting banner is featured.

Band choices

When entering the event menu for the first time, after watching the Obsidian Festival intro, the player must choose one of the three musical acts listed below, with the choice being permanent for the rest of the event.

The choice will affect the special furniture given by completing the Siesta Obsidian Milestone and the music heard in the OF menu.

Musical act Genre Menu theme Milestone reward
Alive Until Sunset choice.png Heavy metal
Professional Speaker System.png
DDD choice.png EDM
Extreme Mixting Table.png
Emperor choice.png Hip hop
Stylish Portable Stereo.png

Band Trends

Upon choosing a particular band, there wil be a small window featuring trends concerning them.

For more information, see Heavy Metal Trend, EDM Trend, and Rap Trend.

Collectibles

Siesta Obsidian

Siesta Obsidian.png Siesta Obsidian are awarded from clearing Main Stage operations and completing Daily Missions.

Rewards will be given once the player accumulated a certain threshold of Siesta Obsidians in the Siesta Obsidian Milestone.

Obsidian Festival Ticket

Obsidian Festival Ticket.png Obsidian Festival Ticket are awarded from clearing Main Stage operations, completing Daily Missions, and the Siesta Obsidian Milestone.

Obsidian Festival Tickets are used to run Fairground operations, which awards Obsidian Festival Token.

Obsidian Festival Token

Obsidian Festival Token.png Obsidian Festival Token are awarded from clearing Extra Show operations for the first time, completing Daily Missions, and the Siesta Obsidian Milestone.

Obsidian Festival Tokens are used for the Capsule Machines.

Siesta Obsidian Milestone

The Siesta Obsidian Milestone rewards can be claimed until March 20, 2020.

50 Siesta Obsidian.png
LMD.png
10K
100 Siesta Obsidian.png
Frontline Battle Record.png
10
150 Siesta Obsidian.png
Skill Summary - 2.png
5
200 Siesta Obsidian.png
Sugar Pack.png
6
250 Siesta Obsidian.png
Obsidian Festival Ticket.png
60
300 Siesta Obsidian.png
LMD.png
15K
350 Siesta Obsidian.png
Frontline Battle Record.png
20
400 Siesta Obsidian.png
Rehearsal Room Belt Shelf.png
450 Siesta Obsidian.png
Obsidian Festival Token.png
300
500 Siesta Obsidian.png
Manganese Ore.png
6
550 Siesta Obsidian.png
Obsidian Festival Ticket.png
70
600 Siesta Obsidian.png
LMD.png
15K
650 Siesta Obsidian.png
Frontline Battle Record.png
30
700 Siesta Obsidian.png
Driftwood.png
750 Siesta Obsidian.png
Shop Voucher.png
80
800 Siesta Obsidian.png
Skill Summary - 2.png
5
850 Siesta Obsidian.png
Obsidian Festival Token.png
300
900 Siesta Obsidian.png
Sugar Pack.png
6
950 Siesta Obsidian.png
Obsidian Festival Ticket.png
80
1000 Siesta Obsidian.png
LMD.png
20K
1050 Siesta Obsidian.png
Frontline Battle Record.png
40
1100 Siesta Obsidian.png
Manganese Ore.png
6
1150 Siesta Obsidian.png
Rehearsal Room Accessory Shelf.png
1200 Siesta Obsidian.png
Obsidian Festival Ticket.png
90
1250 Siesta Obsidian.png
Obsidian Festival Token.png
300
1300 Siesta Obsidian.png
Grit.png
1350 Siesta Obsidian.png
LMD.png
25K
1400 Siesta Obsidian.png
Shop Voucher.png
80
1450 Siesta Obsidian.png
Keton Colloid.png
2
1500 Siesta Obsidian.png
Sugar Pack.png
8
1550 Siesta Obsidian.png
Manganese Ore.png
8
1600 Siesta Obsidian.png
Obsidian Festival Token.png
300
1680 Siesta Obsidian.png
Obsidian Festival Ticket.png
100
1760 Siesta Obsidian.png
Sugar Pack.png
10
1840 Siesta Obsidian.png
Tactical Battle Record.png
40
1920 Siesta Obsidian.png
Manganese Ore.png
10
2000 Siesta Obsidian.png
Obsidian Festival Ticket.png
100
2080 Siesta Obsidian.png
Oriron Block.png
2
2160 Siesta Obsidian.png
LMD.png
30K
2240 Siesta Obsidian.png
Tactical Battle Record.png
40
2320 Siesta Obsidian.png
Sugar Pack.png
10
2400 Siesta Obsidian.png
Amber.png
2480 Siesta Obsidian.png
Skill Summary - 3.png
5
2560 Siesta Obsidian.png
Polyester Lump.png
2
2640 Siesta Obsidian.png
Obsidian Festival Ticket.png
100
2720 Siesta Obsidian.png
Manganese Ore.png
10
2800 Siesta Obsidian.png
Obsidian Festival Token.png
300
2880 Siesta Obsidian.png
Shop Voucher.png
120
2960 Siesta Obsidian.png
Casual Vacation HDm06
3040 Siesta Obsidian.png
Birch.png
3120 Siesta Obsidian.png
LMD.png
35K
3200 Siesta Obsidian.png
Skill Summary - 3.png
5
3280 Siesta Obsidian.png
Rehearsal Room Reception Desk.png
3360 Siesta Obsidian.png
Shop Voucher.png
120
3440 Siesta Obsidian.png
Strategic Battle Record.png
20
3520 Siesta Obsidian.png
Bipolar Nanoflake.png
1
3600 Siesta Obsidian.png
Obsidian Festival Token.png
300
3680 Siesta Obsidian.png
Polymerization Preparation.png
1
3760 Siesta Obsidian.png
Dark Cloud.png
3840 Siesta Obsidian.png
Strategic Battle Record.png
20
3920 Siesta Obsidian.png
D32 Steel.png
1
4000 Siesta Obsidian.png See Band choices

Outfits

The following outfits are available in the Outfit Store:

New

Furnitures

Two furniture sets: Rhodes Island Modern Music Rehearsal Room and Siesta Beach Hut, are available:

  • Some parts for Rhodes Island Music Rehearsal Room are obtained by clearing OF operations and from Capsule Machines and Siesta Obsidian Milestone, while most are available in the Furniture Store.
  • Siesta Beach Hut is available exclusively in the Furniture Store.

EN Heart of Surging Flame Part 3 banner.png
Release date
Global May 13, 2020 ~ May 27, 2020

Login Event

During the event, login to the game to claim the following rewards.

Day 1
Top Emergency Sanity Potion.png
2
Day 2
LMD.png
30K
Tactical Battle Record.png
30
Day 3
Aketon.png
5
Orundum.png
300
Day 4
Recruitment Permit.png
5
Expedited Plan.png
5
Day 5
Originite Prime.png
2
Day 6
Top Emergency Sanity Potion.png
1
Headhunting Permit.png
1
Day 7
Chip Catalyst.png
1
Letters from Wessex

Operators

From May 20, 2020:

Headhunting

The Dancing Lava headhunting banner is featured.

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