〜たるや
as for (and how!), talk about
Noun + たるや
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たるや turns a noun into a dramatic topic, then describes how extreme it is: その迫力たるや、すさまじいものだった, "talk about impact, it was overwhelming".
It's used for striking qualities: power, beauty, amount of practice, anger, excitement. The second half is an intense evaluation: すさまじい, 言葉では表せない, プロ並み, 想像を超えていた.
It comes from the classical たる (= である) plus や, and it sounds literary and a bit theatrical, perfect for reviews, essays and dramatic narration.
Compare たるもの, which states the duties of a role, and plain は, which just marks a topic without emphasis.
Examples
その迫力たるや、すさまじいものだった。
Talk about impact, it was overwhelming.
彼の練習量たるや、プロ並みだ。
As for how much he practises, it's on a par with a pro.
その景色の美しさたるや、言葉では表せない。
The beauty of that view is beyond words.
彼女の怒りたるや、想像を超えていた。
Her anger was beyond anything I'd imagined.
会場の熱気たるや、すごいものだった。
The excitement in the hall was something else.