My ult is being shut down by high armor tanks. I tried taking last whisper but didn't really notice that much of a difference.
Is the passive armor pen from last whisper applying to Katarina's Death Lotus?
Death Lotus, and all of her abilities, deals magical damage. Physical dps items like that won't affect it.
She can get the bonus damage from your attack, but she is using a spell, so it is a magical damage.
Which actually raises a good point; the ultimate should be made to switch between needing armor or magic resist, depending on which way it's actually raised.
Unless they start adding physical attack items with magic penetration ... which would be almost as awkward as Guinsoo's Rageblade.
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