I don't know if this is the right place to post this, but I encountered a bug. When equipped with Spider's Bane, my character is immune to web and other movement-related spells, but not grease. I opened up nearinfinity to check this, and yes, the sword has the effect "immunity to effect (101) - Grease overlay (158)". Still, it does nothing.
I'm playing Baldur's Gate Enhanced Edition v. 1.3.2053
Edit: hmmm... Digging deeper in NI, I looked at the grease spell. It seems on top of this "grease overlay" effect, it also affects movement rate (effect: movement rate bonus (126)). I think the grease overlay effect present on spider's bane doesn't affect this changed movement rate.
EDIT 2 (SOLUTION): I figured it out myself, yay!
Edit 3: It works but I messed something else up. Now haste doesn't work on that character. I'm still looking to make it work. I will, eventually
Edit 4: Holy Bhaal, I was right the first time. It's actually funny. My 3 characters had Paws of the Cheetah (hey, I killed the guy 3 times, stop judging me
). When I was testing if the new Spider's Bane worked, I removed the Paws from my Spider's Bane guy, but the other 2 had them. So IT LOOKED LIKE HE WASN'T HASTED IN COMPARISON, but he was. Anyway, the solution is as follows:SOLUTION
: I added the line from the free action spell (immunity to movement rate bonus (106), which I figured is the slow effect from grease and maybe "slow" itself) to Spider's Bane using nearinfinity. It works now.