I just did a full RJP run, playing extremely defensively. This means that I was able to tank a large number of hits without dying. No trinkets, 2 weapon slots:
Armor: Full chaos
UVs: Piercing med, elemental high
Shield: Swift Strike Buckler
Battle Sprite Ability: Bomb damage med
Battle Sprite Ultimates: Disintegration ray, Iron Heart Attack, Seraphic Aura
Weapons:
Dark Matter Bomb
Winmillion
Strategy:
Spam heart attack; use seraphic aura to heal my shield when it gets hurt; Use disintegration ray to hide behind+spam bombs
If I did have trinkets:
Sword ASI + health
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But I'm doing this to prove a point: Yes, Seraphynx makes playing defensively possible, no it doesn't help any of the guardian armors. They are still sub par to chaos master race.
How well were you able to maintain the defense buff of IHA?