[Daisuke]

Except spending your 300-400 hp doing nothing but normal attacks so you can make use of a passive that's only going to give you half your FP back as HP, which for most melee classes will be around 100 hp, is completely not worth the effort. That skill that has 12 more damage is most likely an autohit, something with more hit chance, extra crit, ignores def and factors in res instead, a silence, a gap closer, or a knockdown. Etc. Other times you're telling a BK not to use steel mind so he can make use of his racial even though he's charmed. That's taking "be conservative with your fp" to an extreme. It shouldn't be "you use 1 spell and this is gone if you don't have any way of restoring FP so just move and attack until you die".

And it's only effective as a second life if you have a lot of FP in general and if you do have a lot of FP, you're most likely a mage and you need to spend FP in order to do anything.

It can turn a fight around if it had a reasonable activation requirement so I agree it should have a drawback and make you play a little conservative with your FP if you plan on using it but as it is now, it's completely not worth trying to use unless you can naturally make use of it (like MGs) since the current "drawback" is too much.