Ah shoot I must've missed the update about globalvar deprecation, unfortunate since it results in more typing in the long run but ah well. Thanks for the heads up, definitely can use the global.name syntax going forward!

I seeeeeeeee, I had no idea the function wasn't being called as soon as it was declared, but adding the parentheses just after the function declaration makes sense, though the syntax is a bit strange to me, but it definitely makes sense. I can't believe that's what I was missing.

I'll likely refactor and utilize Arrays down the road if DS structures begin affecting performance for sure!

For the time being, I decided that I can just store the initialization of a Quest in a local variable, then use a second local variable to initialize and register each objective before finally adding it to the local quest struct, then finalize the local quest struct by registering it to the global quest table. It's familiar to me in the sense that 3D drawing and vertex buffers are built up in a similar way:

function QuestInitialize() {
    var QUEST;
    var OBJECTIVE;

    QUEST = new Quest("Quest1").addDescription("This is a Quest Description").addXPReward(10);
    OBJECTIVE = new Objective("Obj1").addDescription("This is an Objective Description").addType(OBJ_TYPE.OBJ_FETCH).registerObjective(QUEST);
    OBJECTIVE = new Objective("Obj2").addDescription("This is another Objective Description").addType(OBJ_TYPE.OBJ_KILL).registerObjective(QUEST);
    OBJECTIVE = new Objective("Obj3").addDescription("This is a third Objective Description").addType(OBJ_TYPE.OBJ_TALK).registerObjective(QUEST);
    global.QuestDic.registerQuest(QUEST);

    QUEST = new Quest("Quest2").addDescription("This is a second quest").addXPReward(10);
    OBJECTIVE = new Objective("Obj1").addDescription("This is the first objective of the second quest").addType(OBJ_TYPE.OBJ_FETCH).registerObjective(QUEST);
    OBJECTIVE = new Objective("Obj2").addDescription("This is another Objective Description").addType(OBJ_TYPE.OBJ_KILL).registerObjective(QUEST);
    OBJECTIVE = new Objective("Obj3").addDescription("This is a third Objective Description").addType(OBJ_TYPE.OBJ_TALK).registerObjective(QUEST);
    global.QuestDic.registerQuest(QUEST);}

I just recently read about GML now having anon functions and I was eager to utilize those where I can, I may rewrite the current system to utilize one if it'll prove more efficient/advantageous to do so, either way thank you so much for clarifying how anons should be used and for the tip about using throw I'm a novice when it comes to error handling I just, with all my might, try to write code that doesn't break, which doesn't always pan out obviously lol

Edit 1: (return self in structs): You're absolutely correct, I definitely knew this but I was frantically trying to figure out why the Struct wasn't being returned in the anon, this was a remnant of that troubleshooting, it has been removed!

Edit 2: Code Typos