Did some testing with adding and removing traits, and here are some screenies showing this bugoplex broken down a bit.
Screen 1: Switched off of Health Aura using a scroll. This shows that health aura isn’t causing the left-to-right increase in health. Noteworthy thing here is, this team’s health ranges from 200T+ to 400T+ with health aura, a gain of over 2000 times.
Screen 2: No aura, dropped Singularity. Left-to-right increase is gone. It appears singularity is adding the pooled hp for each previous creature in the party order in some way. This screen also demonstrates how auras have exponential effects for creatures to the right of the nether when used with full party stat buffing traits like Solace.
An easy fix for the aura issue would be to make them an “At the start of battle, …” effect, and then increase the cap back to 300% to balance the loss of scaling. For fairness, Auras should be the second-to-last thing calculated, followed only by pooling traits like Singularity(post-singularity aura application would be really broken), so the rest of the party can benefit from the nether’s stat boosting traits. This approach would minimize the chance of bugs popping up.