If you loved Hellboy Animated: Blood and Iron, try Dante's Inferno: An Animated Epic
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.

Hellboy Animated: Blood and Iron

Dante's Inferno: An Animated Epic
What they share
Both films are directed by Victor Cook, and they both carry the dread mood tag, and they sit in Action / Animation / Horror territory. If that's the register that drew you to Hellboy Animated: Blood and Iron, the second film will land in a comparable space — through a different lens.
What Dante's Inferno: An Animated Epic is
Fog curls over frozen lakes beneath a blood-red sky, where iron gates groan open. A knight in scorched armor cuts through shrieking wraiths and twisted penitents, climbing downward through cities of flame and ice. Less pilgrimage than vengeance parade, this is Dante by way of Heavy Metal and hellish arcade rounds.