Are there other published items like the bestiary, which grants a reroll on a failed monster knowledge check after an hour of study? If not, is there a resource of fan-created material of this nature?
Here are some (Eberron-specific) items I've created to demonstrate what I mean and/or get others' creative juices flowing:
A Guide to the Early Annals of the Empire of Dhakaan
Category: Gear
Price: 25 gp
Weight: 3 lb
Description: This book offers lore about the ancient hobgoblin Empire of Dhakaan. When you fail a history check related to the Dhakaani Empire, you can reroll the check by spending one hour studying the guide. You must use the second result.
Contemplations of the Planes
Category: Gear
Price: 25 gp
Weight: 3 lb
Description: This book offers lore about the planes of existence: those of the Astral Sea of Siberys (Daanvi – Perfect Order, Irian – Eternal Day, Syrania – Azure Sky, Lamannia – Twilight Forest, Mabar – Endless Night, Baator – Nine Hells, Shavarath – Battleground); those of the mortal world of Eberron (Dolurrh – The Shadowfell, Thelanis – The Feywild, Dal Quor – Region of Dreams); those of Khyber, The Elemental Chaos (Fernia – Sea of Fire, Risia – Plain of Ice, Kythri – Churning Chaos, The Abyss); and The Far Realm of Xoriat. When you fail a knowledge check (arcane, religion, or dungeoneering) related to the planes or planar effects, you can reroll the check by spending one hour studying the guide. You must use the second result.
Differences in the Methods of Animation of Corpses
Category: Gear
Price: 25 gp
Weight: 3 lb
Description: This book offers lore about animate undead. When you fail a monster knowledge check related to a creature with this origin and type, you can reroll the check by spending one hour studying the bestiary. You must use the second result.
