A runestaff (MIC p. 223) allows a character who's attuned to it to sacrifice one of their spell slots to cast a spell of equal or lower level from the staff. This allows characters to cast spells that they don't know.

However, the spell must be on the user's class spell list. From the item description, MIC p. 224:

By expending a prepared arcane spell or arcane spell slot, the wielder can cast a spell of the same level or lower from the runestaff’s list, as long as that spell also appears on the wielder’s class spell list.

If a character has more than one arcane spellcasting class (say, a Duskblade/Wizard) can they expend a spell slot from one class (say, a Duskblade slot) to cast a spell that appears exclusively on the list of their other class (say, Wraithstrike)?



The requirements listed are:

  • The character must be attuned to the runestaff in question.
  • Sacrifice an arcane spell or spell slot of the same or higher level than the target spell in the runestaff.
  • The spell appears on the character's class spell list.
  • The spell also appears in the runestaff's list.

Note that you do not have to currently know the spell, it simply needs to be on one of your spell lists.

Note also that it does not restrict the spell or spell slot to any one class, it simply has to be arcane.

Here are more details about runestaffs.

It is worth noting that there does not seem to exist much in the way of official clarification regarding using multiple different sources (specifically differing spell lists from multiple classes or prestige) to activate or use an item. This is more of a case where it is assumed that if one meets the requirements, no matter how one did so, it works. On the other hand, there doesn't seem to be any specific indication that it wouldn't work either. There are magic items that specifically require multiple sources to create, so it's not too much of a stretch to have multiple activation sources either.

Therefore this answer assumes a binary test of "do you possess requirements 'X', 'Y', and 'Z'?" If so, then it works, if not, then it doesn't.

  • \$\begingroup\$ You may want to further corroborate your findings with the description of the domain staffs, a subset of runestaffs (Complete Champion 143). \$\endgroup\$ – Hey I Can Chan Feb 16 '17 at 23:59
  • \$\begingroup\$ As arcane was specifically indicated, that is the reason I didn't do so, however your suggestion has merit. \$\endgroup\$ – nijineko Feb 17 '17 at 2:06
  • \$\begingroup\$ I agree with your analysis, but it might be worth taking this a step further and figuring out how it actually works if you do this—and if you figure that out, I invite you to answer this question, because personally I’m rather perplexed. \$\endgroup\$ – KRyan Jul 16 '18 at 21:21
  • \$\begingroup\$ This assumes "spell slots" are fungible between classes, which I don't feel is well supported. Sorry; it's a great answer otherwise. \$\endgroup\$ – fectin Jul 16 '18 at 22:06

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