The Innsmouth expansion is an excellent addition to the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Arkham-Horror/dp/1589942108/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Arkham Horror</a>&nbsp;base game, based on one of my favorite elements of the Lovecraft mythos, the Deep Ones who live under the sea (except when breeding with humans)! Hardcore Arkham Horror fans are going to buy every expansion anyway, so they may safely stop reading here.