Quick Guide to Marks of Triumph
Marks of Triumph are new for book 14, and can be traded in for items at Sages of Eriador next to Reflecting Pools. Below are the locations and the quests that I've found.
All of the quests are on a 5 day cool-down, give you 1 mark, and they are BoA - thanks to Malanthor & Kelswen for confirming
Book X, Chapter 14: The Eye of Angmar
Book XII, Chapter 3: Barad Tironn
Book XII, Chapter 6: Laerdan's Escape
Book XII, Chapter 9: Weapons of the Enemy
Book VII, Chapter 8: The Gates of Carn Dum
Book VIII, Chapter 5: Mordirith's Fall
Book IV, Chapter 8: The Unmarked Trail
Book V, Chapter 5: The Last Refuge
Book V, Chapter 8: Fire and Ice
Book XIII, Chapter 9: The Path of Aearil
*I'm assuming because there is a Sage next to the Forochel reflecting pool, havn't done that quest on Roheryn yet.
All barter items are the same at each Sage, the 3 writ barters are on a 28 day cool-down.
30 marks - Helegrod Armour writ
16 marks - Annuminas Armour writ
8 marks - Angmar Armour writ
10 marks - Beryl Shard
3 marks - Master Jewelers Scroll
3 marks - Master Metalsmith Scroll
3 marks - Master Weaponsmith Scroll
3 marks - Master Tailor Scroll
3 marks - Master Woodworker Scroll