I got locked into a no exit room, so figured it was a good place to test this.

I seem to not be able to use bloodsteep with the sword of darkness.
It fails everytime I use it. I'm not sure if this is due to something unique about the weapon or with the skill so thought I would post it.

*snip*

This weapon is "immune to attempts to change its nature" as indicated by the identify spell.

Thanks for checking.

Damn you Alduk for missing that part!