The Wreath of Snakes (Unreal)

A more up-to-date reference would be Nukemaru’s guide:

English

【Adds Tethers】West(D)：MT　East(B)：ST
【Adds】：Small→Big→Small→Big→Small
　　　　　Silence：1st MT, 2nd ST
【Serpent Ascending (Towers)】
   MT/D1　   ST/D2
 　　　       ☆
   H1/D3　   H2/D4
【Stacks】
 West(D)：MT H1 D1 D3
 East(B)：ST H2 D2 D4

Japanese

【線取】：西(D)側MT　東(B)側ST
【雑魚】：小大小大小　
　　　　　沈黙：1回目MT 2回目ST
【登り龍・塔踏み】
   MT/D1　   ST/D2
 　　　       ☆
   H1/D3　   H2/D4
【頭割り】
 西(D)側：MT H1 D1 D3
 東(B)側：ST H2 D2 D4

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Markers

The ABCD markers are for orientation. The 1 marker represents the center of the arena.

XIVLauncher WaymarkPresetPlugin positions

{
  "Name":"Seiryu Unreal",
  "MapID":1042,
  "A":{"X":100.0,"Y":0.0,"Z":81.5,"ID":0,"Active":true},
  "B":{"X":118.5,"Y":0.0,"Z":100.0,"ID":1,"Active":true},
  "C":{"X":100.0,"Y":0.0,"Z":118.5,"ID":2,"Active":true},
  "D":{"X":81.5,"Y":0.0,"Z":100.0,"ID":3,"Active":true},
  "One":{"X":100.0,"Y":0.0,"Z":100.0,"ID":4,"Active":true},
  "Two":{"X":0.0,"Y":0.0,"Z":0.0,"ID":5,"Active":false},
  "Three":{"X":0.0,"Y":0.0,"Z":0.0,"ID":6,"Active":false},
  "Four":{"X":0.0,"Y":0.0,"Z":0.0,"ID":7,"Active":false}
}