Old weapons as of Ver 0.4:
Dragonslayer greataxe: you can't cast weapon art on point, only from inventory, area of effect reduced(from 8 to 6.5). Also has improved weapon art animation now. Increased durability to 205.
Irithyll straight sword: improved frostbite ability(from 0.25 to 0.33) reduced damage to 27, increased durability from 55 to 66.
Channeler's trident: increased damage to 30.