Last build for 1.6.4. Here's hoping it works right!
[API]Adds modifier reference key strings to API
[API]Adds toString to Color object
[API]Grammar name changes (to align with new rules systems) (minor API breakage)
[API]IWeatherController has new function for rainfall information
[API]IWeatherController temperature/etc functions based on biome id rather than x,z coords
[API]Refactors the basic modifier rules to make adding modifier symbols easier
[Balance]Following link panels should not be available from villagers
[Balance]Reduces frequency of biome symbol trades and treasure
[Balance]Revises rarity categorization for notebook booster packs
[BugFix]Adds missing symbols to creative notebooks
[BugFix]Fixes instability potion effects not affect players
[BugFix]Fixes items being lost when dropped into empty desk surface
[BugFix]Fixes some empty string issues with Agedata saving/loading
[Config]Adds a config option to enable death in an age to respawn you in the Overworld
[Config]Option to disable desk gen in villages
[Crafting]blank pages to paper
[Creative]Fixes desk backboard not showing up in creative menu
[Grammar]Changes grammar rules of terrain alteration and population symbols (req 1, possibly more if none written)
[Grammar]Rebalances all grammar rules to allow more control
[Grammar]Size-based Biome Controllers have a biome sequence rule and two basic biome rules. 3 biomes will halt extras.
[Grammar]Suns, moons, starfields, doodads, visual effects, terrain alterations, populators, and effects now all work like colors; writing one stops generation of more.
[Grammar]The biome sequence rule (presently used in controllers which can take any number of biomes) now produces at least one biome
[Grammar]Writing a biome such that the biome sequence rule is expanded prevents it from generating more
[Interface]Custom TextBox
[Interface]Fixes synchronization on TextBox entry
[Interface]Fixing tooltip postioning and refactoring
[Interface]Reworked the internals of the GUIs (smoother, and more robust)
[Internal]The random symbol selector will choose a random item from a list of 0-weight items
[Localization]Adds system for symbol name localizations
[Localization]Most symbol display names are localized, but not all. Biomes and colors, for example, aren't.
[Performance]Reduce biome wrapper count
[Symbols]Tiled biome can take more biomes
[Visuals]Fixes some poems to remove a repeat