Castlevania: Lords of Shadow

BOSS: Gravedigger:
This Pyramid Head look-alike can be challenging, even though his weapon of
choice is a shovel. the Gravedigger uses said shovel to unearth more Creeping
Corpses to aid him during the fight. This large and imposing boss has many
devastating attacks; most being unblockable.

His signature attack may be an overhead swing that results in a shockwave.
When you see the Gravedigger pull his shovel back and over his head, get ready
to somersault or jump. The boss's other long-range attack is when he buries
the tip of the shovel into the ground and creates a line of fire that shoots
out towards you. A bit easier to dodge in my opinion. Sometimes, the strange
mask the boss wears will split in half, revealing a mess of tentacles for a
face. The Gravedigger then extends the tentacles out to pierce at you.

All of the boss's other attacks are short-range shovel swings. Some of these
attacks can be blocked if you don't feel like dodgin'. I would say that it is
a lot safer to stay up close when battling the Gravedigger than to keep your
distance.

When you're down to about the halfway point in the fight, the Gravedigger digs
up a handful of Creeping Corpses. It's tough enough worrying about the boss
alone, but now you have at least three goons scurrying around. The logical way
would be to focus on them before you go back to fighting the boss. This is
probably the best way to go, although using a Flask while they are all grouped
together will eliminate the Creeping Corpses and significantly hurt the boss.

I found the Gravedigger to be a little sluggish, so I didn't have much trouble
avoiding damage aside from his overhead slam and his quick tentacle sting. I
fully recommend using Shadow Magic on this boss; you should have plenty of
magic from the start of the level, and Creeping Corpses drop Neutral Elemental
Orbs when defeated. Switch over to Light Magic if you're low on health.

As like many boss battles, you are to enter a quick-time event once the
Gravedigger is down to a sliver of health. However, DO NOT grab the boss! If
you do, the boss regains a quarter of his health. Instead, examine the crank
to the right of the Gravedigger and open up the furnace hatch.

By now, the Gravedigger most likely regains consciousness and you must drain
one-fourth of his health again. If this is the case, continue smacking him
around until he is dazed. With the furnace already open, grab the Gravedigger
and follow the ring sequences and button prompts to put a stop to him.
Overall, not a terribly difficult boss fight!

Thanks to Gamefaqs for the solution!

Here is a video solution to go along with the text above. Hope that helps!

Thanks to Cambocombo for uploading the video!