Crucible of Legend is a Storyteller (for those unfamiliar with Exalted or the system it runs on, "Storyteller" is equivalent to Gamemaster or Dungeon Master) Guidebook for Exalted 3rd Edition. It accomplishes its goals quite well, providing advice on numerous facets of the game that weren't covered quite that well in the Core Rulebook, such as how to handle the Realm, adjudicating difficulty levels higher than 5, and numerous alternate rulesets such as simplified crafting (my personal favorite) and handling long treks.

Crucible of Legend also covers Safety Rules and the handling of sensitive content and themes, something much appreciated for a game like Exalted, which can cover a wide variety of topics, some of which might be uncomfortable or even traumatic for players, such as the horrors of war, torture, and other things not fit for polite company.

As I mentioned before, Crucible of Legend also covers alternate rulesets and "rules hacks" within. For example, the Crafting rules can be heavily simplified; don't like how you have to buy multiple crafting abilities, or find it to be too much to handle? There are rules for simply having a generic Craft ability with specialties to handle areas of particular interest to your character. There are rules for simpler stunts, alternative initiative methods, and more. Chances are good that at least one thing that bothered you in the 3rd Edition Core book is addressed here in Crucible of Legend. It even has Flat XP, which I am led to believe is something quite popular amongst the Exalted Community.

All-in-all, a good "Storyteller's Guide" for Exalted. I heartily recommend it. It does what it sets out to do, and it does so well.