Once Na'ima notices the arms, have her roll a Knowledge (Religion) check, DC 12:<br/><br/><div class="spoiler_container"><div class="spoiler_header" onclick="hideSecond (this);" role="button">"Success"</div><div class="spoiler_body">This is known as a crawling hand, a common and efficient undead minion for necromancers.  They're primarily effective in groups, and their lack of intelligence limits their scouting capabilities.  They are more cost-effective than whole bodies for the purposes of creating undead.</div></div>