Styptic pencil.
This. If you're paying attention to your technique, you shouldn't need it. That said, it's damn useful if you do. And for ~$2 USD at your local pharmacy, it's hard not to justify. Better to have it and not need it...
Styptic pencil.
I chose the Merkur 38c HD because it was like the Merkur 34c HD, but with a longer handle. I would recommend that, and also get a Badger brush instead of Boar brush.