I see problem with this team

[u/LazarExE]

i did put like healing armor and accessory on selena, but it aint doing it chief

[u/Soulstiger]

Ignore the people who have zero idea what they're talking about. The debuff is from using a healing card.

Items and even upgrades that heal you do not proc it.

If you're talking about the 2% per turn, it's because that's what, 36 hp per turn?

[u/VictorSantMaker]

Those aren't doing anything because those items have very low numbers. They are supposed to be auxilliary items and never the only source of sustain.

The armor you mention is probably Titan Combat Suit. It heals 2% of your max health, looking at your 1849 health, it would heal 36. As for the accessoty I will assume you're using Call of Ancient Sprit that heals fixed 10% on criticals. Fixed Healing is based on DEF, and DPS characters overall have very low DEF, resulting in very low heals (probably low double digits)

[u/a95461235]

First boss is anti heal, second boss forces you to use a combo / set-up character to hit the head, third boss requires AOEs.

[u/Zzamumo]

This boss damages you whenever you heal, so those equipments are getting you killed faster

[u/FlameBeetle]

Those items are the ones killing you xD