History of Avatar of War

Avatar of War is a triumph worth 25 points: "Acquire a full set of Season of the Seraph armor."

How to complete

1. Play Season of the Seraph and level the seasonal reputation track (Seraphic Rank) with the Exo Frame vendor. Each rank-up grants an engram that can contain a piece of the Warmind's Avatar armor set or one of the six seasonal weapons.
2. Keep ranking up and decrypt the engrams until you own a piece for each armor slot (helmet, gauntlets, chest, legs, class item) for the class you want. Duplicates are likely, so expect to keep going past the first pass.
3. Per one source the set can also be bought from the Monument to Seasons Past for Season of the Seraph currency; I could not confirm current prices or availability, which may have changed since Season 19.

Category and rewards

Which seal or category holds this triumph is not stated by the pages I opened (unconfirmed). No reward beyond the 25 triumph points is documented.

Notes

The armor-set acquisition details come from guides written during the season and may be out of date.