| Zherog Contributor |
David is correct. Here's the quote from the SRD. The same text can be found somewhere in the DMG as well:
SRD wrote:
Magic Weapons and Critical Hits: Some weapon qualities and some specific weapons have an extra effect on a critical hit. This special effect functions against creatures not subject to critical hits, such as undead, elementals, and constructs. When fighting against such creatures, roll for critical hits as you would against humanoids or any other creature subject to critical hits. On a successful critical roll, apply the special effect, but do not multiply the weapon’s regular damage.