Holy cow, I didn't realize such weapons even existed. I always thought assault with defender was as good as it gets, but when I looked on the wiki, I found the following:
Wind:
- Gungnir (Odin's lance) FLB becomes assault++ with pride
- Was-Scepter (Set's staff) FLB becomes defender++ with avalanche+ (rush & barrage)
Fire:
- Bewitching Fire Fan (Dakki's glaive) FLB becomes strength++ (defender & assault) with rush
Water:
- String Hammer Veenavati (Saraswati's hammer) FLB becomes strength++ with stinger
Are there other ones that I missed or weapons that we know will get an FLB later with similar awesomeness?