PST Stage - This is a mod that will allow you to limit the opening of the leveling tree, as well as the opening of skills until the player has a stage
You need a CraftTweaker to work
Package import mods.pststage.PSTStage;
PSTStage.applySkillTreeStage(String stageID, ResourceLocation[] skillTreeID);
PSTStage.applySkillTreeStage("one", [<resource:skilltree:main_tree>, <resource:mymode:tree>]);
PSTStage.applySkillStage(String stageID, ResourceLocation[] skillsID);
PSTStage.applySkillStage("one", [<resource:skilltree:hunter_class>, <resource:skilltree:hunter_crafting_1>]);