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Beowulf unleashed his truest power as a beast-kin, summoning the beast spirit of wolves. Beast-kins were capable of acquiring a variety of unique skills to themselves after leveling up and even evolving a lot. However, due to Beowulf case where he was turned into a Subordinate Vampire, granting him an immediate amount of power, when he leveled up he gained even more strength and unlocked his truest potential quicker as a result.
The power of the Beast Spirits was rare amongst Beast-kins, only the strongest ones or those blessed with amazing magical talent capable of channeling their mana and speak with spirits would be able to achieve this. Beowulf was never talented at magic, and even as a Vampire he was still rather bad at using magic.