[TABLE="class: outer_border, width: 500, align: center"]
[TR]
[TD]Fighter level[/TD]
[TD]Cantrips known[/TD]
[TD]Invocations Known[/TD]
[TD]Spells Known[/TD]
[TD]Spell Slot[/TD]
[TD]Slot level[/TD]
[/TR]
[TR]
[TD]3rd[/TD]
[TD]1[/TD]
[TD]-[/TD]
[TD]2[/TD]
[TD]1[/TD]
[TD]1st[/TD]
[/TR]
[TR]
[TD]4th[/TD]
[TD]1[/TD]
[TD]1[/TD]
[TD]2[/TD]
[TD]1[/TD]
[TD]1st[/TD]
[/TR]
[TR]
[TD]5th[/TD]
[TD]1[/TD]
[TD]1[/TD]
[TD]2[/TD]
[TD]1[/TD]
[TD]2nd[/TD]
[/TR]
[TR]
[TD]6th[/TD]
[TD]1[/TD]
[TD]1[/TD]
[TD]3[/TD]
[TD]1[/TD]
[TD]2nd[/TD]
[/TR]
[TR]
[TD]7th[/TD]
[TD]2[/TD]
[TD]1[/TD]
[TD]3[/TD]
[TD]1[/TD]
[TD]2nd[/TD]
[/TR]
[TR]
[TD]8th[/TD]
[TD]2[/TD]
[TD]1[/TD]
[TD]3[/TD]
[TD]1[/TD]
[TD]2nd[/TD]
[/TR]
[TR]
[TD]9th[/TD]
[TD]2[/TD]
[TD]1[/TD]
[TD]3[/TD]
[TD]1[/TD]
[TD]3rd[/TD]
[/TR]
[TR]
[TD]10th[/TD]
[TD]2[/TD]
[TD]1[/TD]
[TD]4[/TD]
[TD]1[/TD]
[TD]3rd[/TD]
[/TR]
[TR]
[TD]11th[/TD]
[TD]2[/TD]
[TD]1[/TD]
[TD]4[/TD]
[TD]2[/TD]
[TD]3rd[/TD]
[/TR]
[TR]
[TD]12th[/TD]
[TD]2[/TD]
[TD]2[/TD]
[TD]5[/TD]
[TD]2[/TD]
[TD]3rd[/TD]
[/TR]
[TR]
[TD]13th[/TD]
[TD]2[/TD]
[TD]2[/TD]
[TD]5[/TD]
[TD]2[/TD]
[TD]4th[/TD]
[/TR]
[TR]
[TD]14th[/TD]
[TD]2[/TD]
[TD]2[/TD]
[TD]6[/TD]
[TD]2[/TD]
[TD]4th[/TD]
[/TR]
[TR]
[TD]15th[/TD]
[TD]2[/TD]
[TD]2[/TD]
[TD]6[/TD]
[TD]2[/TD]
[TD]4th[/TD]
[/TR]
[TR]
[TD]16th[/TD]
[TD]2[/TD]
[TD]2[/TD]
[TD]7[/TD]
[TD]2[/TD]
[TD]4th[/TD]
[/TR]
[TR]
[TD]17th[/TD]
[TD]2[/TD]
[TD]2[/TD]
[TD]7[/TD]
[TD]2[/TD]
[TD]4th[/TD]
[/TR]
[TR]
[TD]18th[/TD]
[TD]2[/TD]
[TD]2[/TD]
[TD]8[/TD]
[TD]2[/TD]
[TD]Mystic Arcanum (5th level)[/TD]
[/TR]
[TR]
[TD]19th[/TD]
[TD]3[/TD]
[TD]2[/TD]
[TD]8[/TD]
[TD]2[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]20th[/TD]
[TD]3[/TD]
[TD]2[/TD]
[TD]8[/TD]
[TD]2[/TD]
[TD][/TD]
[/TR]
[/TABLE]
I think 2 will work fine, giving me more space for interesting and impactful Patron features. Time to start thinking on those... Much like the Warlock, I want these to assist in showing what kind of Hexblade your character is, so I will be doing my best to make them handle differently without adding too much complication.
Note: The following posts are just me throwing ideas at the wall, to see what sticks for me. Feel free to comment on balance/flavor concerns or ideas, as more minds are always helpful for creativity.