I noticed that in the Book of Vile Darkness, for example, there are a lot of powers/diseases defined as "level+x vs. defense".

I want to be make sure I understand how these are rolled before I build some encounters: as I understand, you roll d20, then add the creature/disease's level, then the other mod. In this case, you might roll a 14 on the dice, add the level (7), then add a given mod (3) and get an attack roll of 24. Is this correct?

  • \$\begingroup\$ Could the title of this be improved? \$\endgroup\$ – Brian Ballsun-Stanton Jan 19 '15 at 1:13

Yes, that's how it works. You compare the total result to the listed defense, and if the total is equal or better than the defense, the attack hits.

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