For this part, you will need to insert coins into the various switches according to its sequence.
The switches are labelled from 1 - 4, insert the coins according to the sequence.
After inserting the coins, you will receive a buff thats acts as a timer. You will be required to insert another coin into the next switch BEFORE the buff runs out.
(note* the buff will keep counting even after dying)
When inserting the coins into the switches, 2 options will be available, which is
孤高なる冒険者 - Lone Adventurer (solo)
集いなる冒険者 - Gathering Adventurer (party)
For solo, only 1 coin is needed for each switch
For party, multiple coins will be needed according to the number of players in party (unconfirmed, requires more data). However, each player could standby on different switches & insert the coins 1 by 1 according to the sequence.
Unlock Dark Angel Statue
After inserting the coins needed into the 4th switch, the statue will be unlocked automatically.