Good thing you’ll be very well prepared then!
The key to this fight is staying out of the way through careful and timely use of Karakuri.
How to beat the Sapscourge
Now for the part you’ve been waiting for.

Block attacks with the Bulwark - but beware the roll!
Not even a Bulwark can stop these roll attacks.
So for maximum damage, focus on the head.

Just remember that it’s a trade-off.
For maximum damage, you should focus the head.
But to reduce the Sapscourge’s threat, then focus on the tail first.

If it rubs its hands together, slide away quick!
Keep a close eye on the Sapscourge and prepare for this attack in particular.
Sapscourge materials: What loot does it drop?
The Sapscourge drops a fair few interesting bits of loot.
A worker is only as good as their tools, after all.