Getting almost no souls in multiplayer; can't use artifacts

I was playing with three other peope earlier, and I was getting 0-1 soul per hit/kill, even when I was off by myself killing everything.  This means that I can only use my artifacts once, and then I'm basically stuck on 0 souls.

Please drastically increase the number of souls gained from kills, especially in multiplayer.  Having to rely on enchantments (increase in souls when using potions) in order to get souls at all is extremely limiting.  In Dungeons 1 I was able to use artifacts repeatedly without even worrying about souls.