The catchphrase that cute, cheerful Princess Yggdra says while swinging around her gigantic holy sword.
Whether because of the incongruity or because Yggdra really means the threat, this became a joke between players, and in all games Yggdra has guest appearances in this line will certainly appear.
The origin of the joke comes from Serene from Riviera: The Promised Land yelling "Come near me and I'll kill you!" while swinging a broom around, but it seems that this isn't well-known.
In Blaze Union, Aegina says this line quite a lot.
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Riviera: The Promised Land Yggdra Union Knights in the Nightmare
Yggdra Unison Blaze Union Gloria Union