I know burn doesn’t stack. The CDR wouldn’t be about trying to stack it but allow you to spread it around a bit more while the aoe size is nice its cooldown kinda limits where you can throw it by a lot. Also if you invest heavy into the line it ends up costing quiet a lot so the reduction in cost would be really nice. The fire/burn damage would just be a nice little bonus.
Most people seem to not realize that leveling is a thing in this game as is hunting gear and without end game gear some skills feel more than a little slow with their cooldowns.
I like the idea.
Energy cost reduction would help a lot our poor Pyromancers and Comandos.
The dmg increase would be almost unnoticable. Less that 1% for onepointer, less that 5% for maxed skill.