UngeheuerLich
Legend
If you are willing to sacrifice a few points of damage, you get by without multiclassing fighter.I fully agree
I noted that one of the gishes build in 5.5 (the bladelock) is a total glass cannon. It doesn't really "work" if you go single class, it's just too fragile.
Make use of armor of agathys. Take the false life invocation until you are a bit higher level. Take the fiend patron for regaining temp hp later.
You actually want to get hit with AoA up. Don't use hex.