the game said it may make certain monsters more vulnerable but how exactly? --- FC white: 0432 7611 3009 XBOX GT: nastopoli Tali is the hottest of all...... you cant take her helmet off so you cant prove me wrong.
Insane monsters take more damage and do more damage. Also sometimes they use different attacks. The standard damage increase against insane enemies is 50%, but this can be modified with abilities (Cthulhu gets another +50% at a fairly high level). I don't know how much enemy damage is increased.
A good strategy for bosses is increasing the combo counter, then turning the boss insane and killing it with a boosted finisher.