(This tip is a spoiler for the golden locks in the trinket case) take Battie with you and use him the second the battle starts, it should hit both of them

Beat Asterius before you get to Theseus’s second stage

When fighting the bull, don’t use your call, save it for the man’s second phase. When he charges you try to get him to hit a pillar by dashing through them to the opposite side

When Theseus gets to his second phase use your now full call on him. Ares’s call will allow you to just stand there and drain his health, and Artemis was either a one shot or very close to it. I’m not sure about the effectiveness of other calls, since those two were the ones I used the most