とてもいい案だと思います！
現状、侍のような攻撃アクションではないため、イルーシブをチャージアクションにしてしまうと街中や移動で「イルーシブｎ連飛び移動」ができてしまう。（これはこれで楽しそうですが・・・）
その点ピアシングタロンとコンボにすれば、疑似的な「戦闘時のみ」という条件を付加できるので、そのような問題も防ぐことができる。理にかなっていると思います。
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