Ethereal Shrubs

Shrubs spring into existence in a 10ft-radius sphere centered around the point within range that you can see. Only the outline of individual leafs and branches can still be seen, which are of shiny silver color, the rest is invisible. 

Any creature that is being attacked by any source which has to reach through the shrubs to make its attack has the benefits of half-cover. When there is 10 feet or more shrub-space between these creatures, the attacked creature instead has three-quarters cover. A creature can also enter the shrubs, which is considered difficult terrain. When a creature enters the shrubs, its body starts getting covered by leafs, turning parts of the creature invisible. Anything inside the shrubs is considered lightly obscured. 

Sounds made inside the shrubs are audible, but those sounds can't be tracked to one specific location by creatures outside the shrubs. Moving through the shrubs sounds identical to moving through real shrubs. Normal scent of creatures is masked by a strong herbal scent, making creatures inside of the sphere undetectable by Blindsight and Perception checks that rely on smell.

Creatures that use the Hide action while fully inside the shrubs are rendered invisible to creatures outside of the shrubs. Moving within the shrubs doesn’t remove the invisibility but does make sound. Casting a spell or harming another creature in any way removes the hidden creature's invisibility. 

The inside of the shrubs are less dense than the outside. Creatures inside the shrubs still can't see creatures hidden by this spell, but can trace their scent and sound as if they weren't affected by this spell.

Any creature within 30 feet of the shrubs and with vision on the shrubs can make a Wisdom(Perception) against your spell save DC to search for invisible creatures. On a success, all creatures inside the shrubs that were previously rendered invisible by the spell are visible to that creature and can’t hide inside the shrubs again for that creature until it loses vision of spotted creatures. 

At higher levels: when casting this spell at a higher level, the shrub gains an additional 5ft radius for each level above the 3rd. From 5th level, all creatures entering the sphere for the first time are instantly rendered invisible as if they just used the Hide action.