Does openbsd have dm-crypt/LUKS analogues where i create an
encrypted volume with ease?

"With ease"??? Hah. This is OpenBSD, not Apple. Don't expect anything to be easy with OpenBSD.
With that said, I don't know of any full-disk encryption for OpenBSD.

Кстати, чо там насчет полнодискового шифрования в OpenBSD?