Yeeeeah... remember those senses I mentioned?
Anyhoo, Ares, technically yes, but practically no. As a lieutenant to one of the horsemen of the apocalypse he's too beefy to be called by simple summoning spells (yes, even Call from Beyond V). Since all we're interested in are the Tears, we could f.ex. go to his home base and ask for them. Problem is, that home base is deep in Abaddon, which aside from being incredibly hostile terrain for everyone in the party, is a wee bit out of scope for this adventure.