Você deve poder conversar.
A função
Varinhas é usada com Trigger de soletrar método de ativação de itens. E Spell Trigger diz em sua descrição:
Spell trigger activation is similar to spell completion, but it’s even simpler. No gestures or spell finishing is needed, just a special knowledge of spellcasting that an appropriate character would know, and a single word that must be spoken. Anyone with a spell on his or her spell list knows how to use a spell trigger item that stores that spell. (This is the case even for a character who can’t actually cast spells, such as a 3rd-level paladin.) The user must still determine what spell is stored in the item before she can activate it. Activating a spell trigger item is a standard action and does not provoke attacks of opportunity.
Se você não puder falar, você não poderá falar essa única palavra, então você não poderá ativar o Wand.