Dispel Shield

You target one object or creature which you can see within 10', and which is affected by an on-going, dispel-able magic effect.  You then cast the Dispel Shield around that specific effect.  If the object/creature has multiple on-going effects, the caster must select a specific one to shield.   A Dispel Shield cannot be any stronger (i.e., have an effective level higher than) the spell effect which it is shielding.

When the object/creature is targeted by Dispel Magic, the original, "shielded" effect will not be dispelled.  Instead, the Dispel Shield will be subject to the effect of the Dispel Magic.  The effective level of the Dispel Shield for determining whether or not it is dispelled is the lower of the spell slot level used to cast the original, "shielded" effect or the spell slot level used to cast the Dispel Shield spell.

As an example: Invisibility is cast using a level 4 slot on Ferdkin and 2 other creatures, and then a Dispel Shield is cast  (using a level 5 slot) on the Invisibility spell on Ferdkin.  This means the Dispel Shield has an effective level of 4.  If a Dispel Magic is cast using a level 3 slot, the caster will have to make a spellcasting ablity check with a DC of 10 + 4.  If they succeed the Dispel Shield is dispelled (but the Invisibility is not.)  If they fail, neither is dispelled.  If the Dispel Magic was cast using a level 4 (or higher) slot, the Dispel Shield is automatically dispelled, but the Invisibility remains unaffected (unless another Dispel Magic is subsequently cast.)

While it is in effect, the Dispel Shield spell will also mask the original spell effect from a Detect Magic spell; the Dispel Shield itself will be detected and radiate an Abjuration aura.