It's safe to say that upcoming gamebook Askaryl's Grimoire probably has one of the most epic trailers in its genre. Scheduled for eventual release on various iOS devices, Askaryl's Grimoire will have you taking on the role of Edhan as he attempts to retrieve the aforementioned tome. Along the way, you're also going to have to avenge your mother's death somehow - standard procedure for heroes, really. There is apparently a fairly comprehensive combat system, mini-games, and a gamut of illustrations.

If you're curious and want to learn more, check out the official website here.