Web of Chaos epic items

Seal/Shard/Scroll drop locations
From Update 18 release notes:
 * Seals for the Web of Chaos items are now found in the Epic Chests at the end of the quests.
 * Seals are found in the same quests as their respective base item (e.g. the Envenomed Blade seal is found in the quest the Envenomed Blade drops in - the Lords of Dust)
 * Shards for all items in this quest chain are now found in the Epic Chest at the end of the capstone quest The Spinner of Shadows.
 * The base items will continue to drop on all difficulty levels.
 * Drop rates for Seals and Shards have been increased for Epic difficulty. Shards and Seals now have a 5% chance to drop on Epic Casual, 10% on Epic Normal, 15% on Epic Hard and 25% percent on Epic Elite.
 * The drop rate applies to seals and shards separately in Spinner of Shadows, meaning it is possible for both a seal and a shard to drop for the same character.
 * Scrolls drop from monster kills in any of the three quests in the Web of Chaos release.