How to create a fragment. (This thing is experimental and may contain bugs)
Fragments json IS NOT RELOADABLE!
Restart mc or server to apply changes.
Also if you removed or added a fragment delete your solar lexicon and make new (or tell player to do it).
Translation key for lang files is constructed by this formula: "ancient_fragment." + unique_id
First of all start by
(// - those are comments, don't write them in json file)
{
    "type": "" //a type field declares what type of fragment you are creating. (Possible values: "information","items")
}
Information type format:
{
    "type": "information",
    "unique_id": "",                    //unique id is the unique identifier of the fragment(ah yes logic). Should be different than all other fragments. (String)
    "category_base": "",                //defines the category in solar lexicon where that fragment will be located. (Possible values: scroll down)
    "sub_category_base": "",            //defines the subcategory in category where that fragment will be located. (Possible values: scroll down)
    "progression_stage": "",            //defines what progression stage is needed to be completed to unlock this fragment. (Possible values: scroll down)
    "translation_id_lore": "",          //translation id that needs to be translated in lang files. Defines the lore inside the fragment. (String)
    "icon": {
      "item": ""                        //item to be used as an icon (String that should match any of existing item in the game)
    },
    "priority": 1                       //priority to unlock this fragment (for example if there are a fragment with priority 1 and 2, the 1 will be opened first) (Integer)
}
Items type format:
{
    "type": "items",
    "unique_id": "",                    //Unique id is the unique identifier of the fragment(ah yes logic). Should be different than all other fragments. (String)
    "category_base": "",                //Defines the category in solar lexicon where that fragment will be located. (Possible values: scroll down)
    "sub_category_base": "",            //Defines the subcategory in category where that fragment will be located. (Possible values: scroll down)
    "progression_stage": "",            //Defines what progression stage is needed to be completed to unlock this fragment. (Possible values: scroll down)
    "translation_id_lore": "",          //Translation id that needs to be translated in lang files. Defines the lore inside the fragment. (String)
    "recipe_type": "",                  //Recipe type to use (Possible values: "infusing","infusing_crafting","crafting_table","smelting"(currently smelting doesn't allow multiple items)) (String)
    "items": [                          //An array of items to show inside the fragment. Icon for this fragment will be the first item in array
      {"item": "", "recipe_id": "" },   //item is an item name (for ex: minecraft:diamond), recipe_id is a recipe to show inside the fragment(SHOULD MATCH THE RECIPE TYPE!).
      {"item": "", "recipe_id": "" },
      {"item": "", "recipe_id": "" }
    ],
    "priority": 1                       //Priority to unlock this fragment (for example if there are a fragment with priority 1 and 2, the 1 will be opened first) (Integer)
}
POSSIBLE VALUES:
Progression Stage (more info can be found inside ProgressionStage.java class):
PRE_BEGGINING
BEGGINING
BEGGINING_2
PRE_FORGE
FORGE
AFTER_INFUSER
AFTER_CATALYSTS
PRE_LENS
AFTER_LENS
SOLAR_ENERGY
DIMENSION

Category Base:
BEGGINING_INFO
EXPLORATION
ARMOR
STRUCTURES
UPGRADES
RUNIC_ENERGY
BEGINNER
SKILLED
MASTER
MIDGAME

Sub category base:
BEGGINING
BASIC_DUSTS
WORLD
ARMOR
STRUCTURES
BEGINNER_ITEMS
BEGINNER_BLOCKS
BEGINNER_MATERIALS
RUNIC_ENERGY_EXPLORATION
RUNIC_ENERGY_TRANSMITTING
SKILLED_ITEMS
SKILLED_BLOCKS
SKILLED_MATERIALS
MASTER_ITEMS
MASTER_ENERGY
MASTER_MATERIALS
UPGRADES
RADIANT_LAND

An example of fragments json:
 {
   "fragments": [
     {
       "type": "items",
       "unique_id": "test_fragment_items",
       "category_base": "exploration",
       "sub_category_base": "beggining",
       "progression_stage": "pre_beggining",
       "recipe_type": "infusing",
       "items": [
         {"item": "solarcraft:illidium_sword", "recipe_id": "solarcraft:infusing_new_illidium_sword"},
         {"item": "solarcraft:qualadium_sword", "recipe_id": "solarcraft:infusing_new_qualadium_sword"}
       ],
       "translation_id_lore": "testlore",
       "priority": 1
     },
     {
       "type": "information",
       "unique_id": "test_fragment_info",
       "category_base": "exploration",
       "sub_category_base": "beggining",
       "progression_stage": "pre_beggining",
       "translation_id_lore": "testlore_info",
       "icon": {
         "item": "minecraft:dirt"
       },
       "priority": 1
     }
   ]
 }
