Just throwing this out there, as I haven't seen anyone else recommend it yet. The new Energy Fusion spellshape for Sorcerers is really great! The old Energy Fusion metamagic only worked with "acid, cold, electricity, fire, or sonic damage", but the remastered version works with ALL energy damage types, which includes force, void, and vitality!
ENERGY FUSION FEAT 10
CONCENTRATE SORCERER SPELLSHAPEYou fuse two spells together, combining their energy types. If the next action you use is to Cast a Spell that deals energy damage, select a non-cantrip spell in your spell repertoire that deals a different type of energy damage, and expend an additional spell slot of the same rank as this secondary spell. The spell you cast deals additional damage equal to the rank of the secondary spell slot expended. The spell’s total damage is divided evenly between the energy type of the spell you cast and the energy type of the secondary spell.
For example, I used a 5th-rank Force Barrage spell (2-Action cast, 1 action spellshape) with it to turn half the damage of each "magic missile" into sonic damage in a fight against a golem with a sonic weakness (Crystal Sentinel), as I had no other good spells available. Made 36d10 [=6x6d10] damage!
Some low-rank spells are really good for that conversion:
- Thunderstrike gives the option to deal either lightning or sonic damage
- Force Barrage for never-resisted force damage
- Grim Tendrils which gives arcane Sorcerers easy access for void damage
- Heal for primal Sorcerers to easily access vitality damage on every spell, and you're likely to have it as a signature spell anyway.
I usually took Overwhelming Energy at level 10 on a blaster Sorcerer, but Energy Fusion seems better, as you can easily trigger any known weakness. Feel free to have your Fireballs deal half lightning, thunder, force, void, vitality, ... damage. And at level 10 you usually have low-rank spell-slots to spare (especially with a Ring of Wizardry).
Elemental bloodline and Draconic bloodline Sorcerers with an energy breath weapon will especially love this spellshape, making your focus spells always useful options.
The following part might be ruled differently by your GM, but the way this spellshape is written seems to allow using it with sorcerer spell-slots + non-sorcerer spells from other repertoires (i.e. archetypes), as the feat only requires you to sacrifice a spell-slot of equal rank to the selected spell. Notably it does not require that you're able to cast the selected spell from the expended spell-slot. For example, an arcane Sorcerer with a 1st-rank Heal from the Oracle basic spellcasting archetype feat could sacrifice one of his 1st-rank Sorcerer spell-slots to fuse vitality energy into his Chain Lightning. YMMV but I'm confident in it being allowed RAW.
Have fun with fusion!