[quote=@Valen]
<Snipped quote by Lurking Krog>

I'm actually not familiar with that one.  Let me check and get back to you.
[/quote]

All good, here is a [url=https://5e.tools/items.html#sentinel%20shield_dmg]link[/url] to 5e tools. It's also in the DMG14 pg 199.