Invisible Enemies

[Vegitto24]

Last night when I was moving towards Avendell I met vampires and some of them were invisible. The disciple warriors were also invisible one time. I was able to kill them but that was not right, is it? This a core engine bug? Did anybody else experience anything like this?

[Lokey]

Always happens occasionally, I think maybe happening more because of cool thing I did. Looking into, but want to check against new server versions as well, because cool.