Verified for patch 16.8.1

Emergency Shielding+

At 40% Health, gain a 75% max Health shield that decays over 4 seconds.

Source

Factory New

Effects

Duration: 4
PercentMaxHealthShield: 0.75
TriggerHealth: 0.4

Emergency Shielding+ enables

Shield On the Menu

Grants temporary HP that absorbs damage before the unit's real Health is touched.