So the gold charge of flamethrower releases flames for 2 seconds plus extra for skill points and then will use your remaining mana to sustain the attack.
Manaburn will increase damage by 10% per point invested if you cast skills under 50% mana.
Manaburn is a very special talent where most skills won't get a benefit at high charge levels or you will need to build your character to get this bonus damage. Gold charge flamethrower having a 50 mana cost makes it hard to build for manaburn however since it starts to consume mana to continue to use it after a time I think that after your mana goes below 50% once that happens it should get the manaburn buff.
Manaburn will increase damage by 10% per point invested if you cast skills under 50% mana.
Manaburn is a very special talent where most skills won't get a benefit at high charge levels or you will need to build your character to get this bonus damage. Gold charge flamethrower having a 50 mana cost makes it hard to build for manaburn however since it starts to consume mana to continue to use it after a time I think that after your mana goes below 50% once that happens it should get the manaburn buff.