For gauging the power of magic items, I tend to rely heavily on the excellent Sane Magical Item Prices document that tends to be pretty well researched and highly regarded. Thus far, I’ve always agreed with them on their prices and have taken to allowing those prices without consideration.
That is, until for my game last week I needed a simple, not super powerful defensive item and figured the Sentinel Shield would be a nice little reward, only to see later that it’s listed as being worth 20.000 gp.
I’m really stumped at why it would be listed as being this powerful. According to the document, the Sentinel Shield is on the same level of value as a +3 weapon or armor, the Armor of Invulnerability, a Ring of Spell Storing or a Mirror of Life Trapping.
Is getting Advantage on Initiative and/or Perception really that amazing? Or am I missing something? Or is it just grossly miss-valued?