In Wrath of the Lich King it is item level 226, requires level 80 and sells to vendors for 10g 85s 81c. In MoP Classic it is item level 213, requires level 80 and sells to vendors for 10g 85s 81c.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Serene Echoes Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Serene Echoes suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Serene Echoes is part of the transmog set Valorous Regalia of Faith (Priest only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Serene Echoes Fits
Other Items Named Serene Echoes
1 other item in the current build is also called Serene Echoes. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 40236 (40233 to 40241) were usually added in the same batch as Serene Echoes: the same quest line, zone, vendor or reward set.