For a long term playthrough with NG+ I would def get this investment. It requires the same INT as Cast Light anyways.

Souls are cheap. Once you get to the painted world, souls are extremely easy to get.

It's not about the souls, it's about being able to repair equipment on the go. This is what you want to use alongside weapons that eat through their durability with their special attacks.

I die a lot, so being able to full repair when having 0 souls is nice

never used it before but i think it fully repairs

full repair for armor, 150 durability repair to weapons. So if you use Grant's AOE attack which causes 200 durability loss, this spell will only restore 3/4 of the damage done. You can cast it, rest at bonfire, and cast again repeatedly as needed to repair weapons though, which saves a lot of souls

Notes: It cannot repair crystal weaponry. Someone's lying out of their ***, here.

Also don't you "repair" an item when you upgrade it? I thought that was a legit strat for some trying to SL1?

Just use it at a bonfire and get free repairs. takes a little longer but hey, it's still free.

Its a math thing. Halved spell that has one charge gets rounded one to zero.