Shield induction overlay introduced in SC SUM 1.37 image - SC SUM - StarCraft Super Unit Mod for StarCraft
SC SUM is a Mod based on StarCraft Broodwar 1.16.1 that preserves the classic StarCraft gameplay with all its original units, upgrades and abilities but enhances the tech tree by three new unique super units, corresponding new research facilities and lots of new upgrades and abilities. In detail: 3 new super units, 1 new support unit, 3 new buildings, 15 new abilities and 3 new upgrades.
"Shield Induction" is actually quite an old ability of the Mothership. Until version 1.36 this skill was available by default and it was not visually indicated which units are under protection of the Mothership. This lead to a misunderstanding - or even unawareness - of this feature.
With SC SUM 1.37 the functionality of Shield Induction will become a lot clearer as it needs to be researched now and more importantly units within the Mothership radius will show a bluish overlay.