The Paul Nicholls-trained seven-year-old made all the running to win a thriller.
Frost, who became the first female to win a Grade 1 at the Festival, was pestered for the lead early aboard Frodon, but his brilliant jumping soon had him in an outright lead.
The 9-2 shot kicked for home approaching two out with a number of challengers snapping at his heels, none more so than Aso.
Venetia Williams's charge briefly led and looked on course to land a 33-1 shock, but Frost galvanised her mount to win going away to the delight of the crowd, with Road To Respect (9-2) back in third.
A delighted Frost said: "My god, he jumps and just at that minute when he got overtaken, most horses would quit, but he grabbed me by the hands and said, 'don't you dare give up, don't you dare not send me into the last – I want this more than you, now come on, where are you'.
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"Just look at what he's done there – deny that he just loves racing. He's unbelievable.
"He just made the dream come true, it's just incredible. He will deserve every single high five, pat and carrot."
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