LogFAQs > #884961521

correct.

(30%) Tri-beam Laser: Magic damage (2.8x) with ignore SPR (25%) to all enemies (white laser)
(30%) Tri-beam Laser: Magic damage (4.2x) with ignore SPR (25%) to all enemies (yellow laser)
(30%) Tri-beam Laser: Magic damage (5.6x) with ignore SPR (25%) to all enemies (orange laser)
(10%) Tri-beam Laser: Magic damage (22.5x) with ignore SPR (25%) to all enemies (red laser)

basically 10% of the time you utterly destroy any boss. but if you're asking for 400k damage in AoE, that sounds like it may be doable even with 30%, especially if you've got two of them. Ace cheese is basically spam Tri-beam Laser and if you get 10%, you win.
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"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.