Let Boyd tank the spiders if you can. After the spiders are dead move closer to one of Freja's heads and stay at the opposite side from Boyd.
Ashen Knight Boyd is a white phantom available for summoning in the Brightstone Cove Tseldora area for The Duke's Dear Freja boss battle. He is wearing the Royal Soldier Set and armed with an Estoc.
"A monstrous two-headed spider which serves as the Keeper of the Writhing Ruin. Apparently Duke Tseldora's pet and more than likely the progenitor of the swarms of Parasite Spiders which overran and destroyed Brightstone Cove. But What could the Duke have wanted with such an abomination, and what madness could have possessed him to allow the destruction of his own domain...?"
A gigantic two-headed spider, fought in Brightstone Cove Tseldora. She guards one of the Primal Bonfires. Unusually, despite being one of the four main bosses of the first half, she does not wield a Great Soul, only guards it. Thus it can be said that the true "boss" is not just her, but the entire Writhing Ruin that contains all her spider hatchlings.
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The Duke's Dear Freja is a boss in Dark Souls II. The Duke's Dear Freja is a gigantic two-headed...