Sometimes you get hit and “dodge” - you don’t take any damage, and if you are using the NecroShield Suit, the aura is retained (however, IIRC you can get stunned)
There are a few things that contribute towards the chances of this
- A base dodge chance - I estimate this to be approx 5%
- Ninja Garb - +7%
- Dodge Master perk - +10% each
- Adrenaline - max +25% proportional to damage taken (e.g. +5% at 80% health and +20% at 20% health)
- All-Hero Bonuses: Mr. AutoFire and JackBot both have +5% at Level 20 and then again at Level 50
- Hero Specific bonuses (e.g. Firebug +10% at Level 40) and Skills (Mortis and Prospero have 1% in two places of the skill tree… pfft)
Also be aware that ninja and adrenaline no longer appear in the normal perk rotation
Note that the maximum dodge chance is capped at 50%