User blog comment:Linathan/Squad Spotlight & Guide: Trial EX8 - Genius' Challenge/@comment-28459386-20160725000050/@comment-26140304-20160725004610

These were my Ark's enhancements: I decided not to go with the rainbow build since I know there's going to be a decent amount of Ark leads out there with the rainbow build. It's also considering I wanted to gear my Ark towards harder content rather than the FH/FG-oriented Arks. Thus, I felt that the crit and elemental null were necessary. I could just take elemental null and not crit null since I have Lara, but I didn't really want to take up another slot for Lara since her buffs aren't really as good as other units, even though she's very efficient.
 * Hugely boosts Def relative to how low remaining HP is (10)
 * Adds status ailment removal effect to SBB (10)
 * Adds critical damage negation to BB/SBB (40)
 * Adds elemental damage negation to BB/SBB (40)