Anet really calling me out about my L60 green aquabreather with no rune.
"Each equipment slot will display a red exclamation mark and a warning message in the tooltip when hovering over the slot under the following circumstances:
A slot is missing equipment.
Attributes have not been chosen for equipment with selectable attributes.
Equipment does not have upgrades (runes and sigils).
Equipment is below exotic quality.
Upgrades are below superior tier."