[Snake]

I'm also okay with this on Lolzy's terms.

50% more difficulty, 50% less effectiveness. So a vorpal + rampaging would only eat away 5 defense total, depending on the weapon, while getting the full benefit of that 10% vorpal chance. Or rampaging + vorpal, where 10 def is shredded, but you only have 5% chance to vorpal on crits.