From the Rifts: Book of Magic, I thought these invocations made some sense:
- Level 3: Create Wood (10/20 P.P.E.)
- Level 6: Barrage (15 P.P.E.)
- Level 7: Ballistic Fire (25 P.P.E.)
- Level 10: Meteor (75 P.P.E.)
- Level 11: Firequake (160 P.P.E.)
- Level 12: Heavy Air (200 P.P.E.)
Through the Glass Darkly offers one spell in particular, called Scarlet Pepper, that seemed neat.
Living Fire Magic seems thematically appropriate, but ultimate felt like just "more of the same" as I looked the spells over.
Blue Flame Magic seemed an interesting fit, but looks like it might be a little powerful.
I thought I saw a spell somewhere in Palladium's catalogue that was similar to the D&D "Fireball," where the fireball would explode upon a radius, but I can't find it now.
I had a thought that Illusion magic might fit within the Fire Warlock's wheelhouse rather nicely. The Invisibility spells, Multiple Image, Apparation, Horrific Image, Mask of Deceit, and others as well. I'm not sure if that doesn't increase the spells they have available by too much, though.
I thought I'd collect some thoughts. What other spells exist that someone might consider adding to the Fire Warlock spell list? What about the thoughts I've presented - too much? Not enough? Let me know!