Pro Tip: If you're having a hard time against Ignis, try this.

[Triplinster]

With the recent Chimera update. DE added a new option in the display settings called "Effects Intensify". 
 

Spoiler

This allows you to control the bloom brightness it seems. And it is greatly useful against Ignis. Below I will leave comparisons of Effects Intensify 10 vs 100 (Both with adaptive exposure ON as that also helps a bit)
 


I will also leave real TTK tests of Ignis Wraith against Stock excalibur (145 Shield, 110 Health, 110 Armor)
 

Spoiler

So another advice. Play the TTK game if possible. Most weapons have slightly lower effective TTK (vaguely accounting for spread and human error) and more than 2x lower TTK on paper (not accounting for spread and human error). 

Defend yourself from Ignises rushing into you by taking advantage of the visibility option and lower TTK of your weapon.