Seekers wrote:ITD works on every wdm attack, ranged or melee.
It does not work vs bosses (gold name) at all.
It does not change the defense the target, only the attacks of whoever is using the ITD items ignore the defense (so if you are using it, neither your merc or summons benefit from it).
Additionally, you still have less chance to hit things that are higher than your level and you are still capped to 95% cth even when using ITD.