Much harder to knock you over. The system itself points out that this is not necessarily good news.
The Enchanted Shade Gnoll Riot Forces Crowd Control Shield grants +5 to Rooted in Place, so Carl looked the skill up. The description is unusually candid: it makes it much more difficult to knock you over or back, 'that's not necessarily a good thing, physics being what they are. Be careful with this one.'
Carl said as much out loud — he liked the shield but was worried about the wording on rooted in place. For a crawler who spends her fights standing in front of charging masses, refusing to be moved is a benefit right up to the moment the thing hitting her is bigger than she is.
A defensive property with a warning label written by the people who sold it to you.
A stability buff the system openly flags as double-edged.