Well, I dont think the name "filler feat" is too lucky. They arent chosen because we cant think of anything good to pick, but are forced to pick something.
I much prefer "half feat".
The list of feats in BG3 that we get is of course controlled by the original D&D5 PHB list, which is rather short, compared to previous editions of D&D.
Would be great if there would be more choices for half feats, especially for Constitution, Intelligence, and Wisdom, where the choices are few.
Brainstorm:
- Skill Excellence - Gain Expertise in a single Skill, and gain +1 on the associated Attribute, with the usual limit of 20. Can be taken multiple times, but only in skills one doesnt have Expertise in yet. Prerequisite: at least 13 in that Attribute.
- Understudy - Gain +1 Charisma, Wisdom, or Intelligence, and gain Proficiency in two skills associated with that attribute. Can be taken multiple times, but each time for a different attribute. Prerequisite: 13 in that attribute.
- Shield Useage - Gain Proficiency in Shields. Also gain +1 in any Ability Score, with the usual limit of 20. Prerequisite: Light Armor Proficiency.
- Dualist - Gain the ability to wield a larger than small, but not larger than versatile weapon in the main hand while duawielding. The offhand has still to be small. Also gain +1 Dexterity or Strength, with the usual limit of 20. Warning: No point in taking this if you already took Dualwielder, which is obviously superior, but doesnt give an ability score increase.
- Ambidexterity - Gain +1 Dexterity or Strength, with the usual limit of 20. Attacks with the Offhand weapon can instead be done with the main weapon, and vice versa (i.e. you can switch both as a free action at any time). Prerequisite: Dexterity 15.
- Quick Draw - Gain +1 Dexterity or Strength, with the usual limit of 20. Once per Short Rest, change one weapon category (melee or ranged) for another set of weapons or weapon and shield or twohanded weapon as a free action. Prerequisite: Strength 13.
- Mystic Dominance - Gain +1 Charisma, Wisdom or Intelligence, with the usual limit of 20. Spells working on this attribute have their DC raised by 2. Can be taken multiple times, but each time for a different attribute.
- Wild Mysticism - Gain +1 Charisma, Wisdom or Intelligence, with the usual limit of 20. Spells cast based on this attribute have a random 25% chance to not use up a spell slot. Can be taken multiple times, but each time for a different attribute.
- Priest Devotion - Gain +1 Wisdom, with the usual limit of 20. Once per Short Rest, out of combat, you can ask your deity for restoring a spell slot. Asking for a restored level 1 slot always succeeds. For higher spell levels, you roll a d20 for success chance, against a DC of 11. Your Wisdom modifier gives a bonus, every higher spell levels than 1 give a corresponding malus. Your deity might grant you a bonus on this roll, or even automatic success, if they've been especially pleased with you. Prerequisite: Wisdom 15 and ability to cast Wisdom based spells (Cleric 1, Druid 1, Ranger 2).