@EncodedNybble
Well, I for one love Homing Soul Arrow, not only for it being a 4x Soul Arrow, but for the ability to use it as a trap against any enemy, as the spell hangs above you until an enemy comes into range. It's pretty good to cast it around a corner, kite the enemy, wait for it to come to you and have him getting hit by the four simultanious arrows for 1000 damage xD For the Old King and Penetrator, Moving Soul Arrow works magnifically well.
You can pretty much get a less soul gaining effect (32%) using Silver Bracelet + Ring of Avarice than just using Soul Thirst, plus Soul Thirst is a very MP expensive spell (200 MP), so you'll need at least 30 intelligence to cast it, only lasts for 30 seconds, and you'll be out of mana for pretty much everything else.
I just don't see it worth it, unless you have a high intelligence stat.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
