When bats suck your blood to death, no grave is created and no death message is stated. I imagine this has to do with how the Rough Mobs mod handles the bat damage. Maybe it isn't thought?

This is an issue within Rough Mobs; they say they've fixed it.

Also, which version of both mods are you using?

Interesting. I'll see if I can figure this out; the mod doesn't have a public code repository, so it may be a bit difficult to pinpoint the issue.

1.94
forge 12.17.0.1987
Rough Mobs 1.0
Tomb Many Graves 2.1.5

The obvious work-around for now it to disable their blood sucking through the configs, but it was a neat trick :(

Hopefully I can work around it in-code. Give me a little while. ;-)

Thanks!

Edit: I have experienced it now. I'll keep working

I was unable to recreate this bug. I let a bat suck my brain dry and the grave spawned in the correct spot. I'm also using the 2.1.6 version of TMG, but the update only added features and doesn't affect how graves spawn (unless underwater)

The mod seems to be cancelling the event I use to spawn the graves; I'll see if I can find out why/how they are doing this.