This pack really needs more scripting for Thaumcraft aspects. The deconstruction table sucks.
That's a ton of work though. I'd conisder making a recipe for knowledge fragments though.
is there a way to get a passive, or one click remove wither / poison / fire ettects?
There's a staff that removes fire you can get in the Nether:
http://adventofascension.gamepedia.com/Ember_Staff
There's also a much later staff you can get that removes all status effects instantly:
http://adventofascension.gamepedia.com/Web_Staff
Another thought about the Precasia. For the matter of The Spice of Life mod being added in, the Skeletal Armor should most likely be disabled, or at least have its cost made much, much higher. Especially considering other infinite food items (Think The Fruit of Grisaia) are extremely endgame.
While that is true, you also miss out on every other armor buff. There's an armor that constantly spawns friendly weak short lived minions, an armor that grants infinite resistance, armor sets that negate poison, withering, fire, etc. One that gives stupid regeneration, one that reflects all damage taken back on the attacker, one that boosts sniper fire, and then there's this beast as well:
http://adventofascension.gamepedia.com/Nethengeic_Armor . There are so much more than that available. I just mentioned the armor sets off the top of my head.
So you have a choice really. Either carry around some food with you on your expeditions and wear armor with an incredibly useful buff, or wear armor that just feeds you and free up a few slots in your backpack. And six types of food is easy enough to maintain that the skeletal armor isn't much of a boost at all really.
I think instead of having books with explination of certain mod elements and having a big list of stuff to read, I think it should be incremental, and 'optional' achiements such as... "surviving your first night! try to create an enclosed space with a bed to sleep through the night creatures" then "Familiar Steps! back to basics we need to go mining till you can gather some diamonds, all additional ores added by this modpack (minus TiC ores) need diamond to obtain.
just small milestones to follow if lost rather then a book containing information on everything and getting a bit full on.
The thing is, this is such an expansive mod that you need a lot of information. The point of the books is to supply information about the mod and the pack in general without forcing the player in one direction or another. Achievements or quests would make gameplay more linear.