5e Swordmage homebrew.

[bloodshed343]

Ahh. The weapon isn't actually magical. It's only considered magical for immunities and resistances. It's still a mundane sword in all other respects.

I think the warlock feature gives you an actual magic weapon.

Edit: the warlock feature functions similarly, but gives you automatic proficiency in any weapon of your choice and creates the weapon for free while sword bond is limited to weapons with which you are already proficient and requires an already existing weapon. Since blade lock is basically the same but with a feat and a free weapon thrown in 2 levels later, I'd say it's okay, especially since being magic offers absolutely no bonuses those first two levels.