While you are holding a Shield, you have a +3 bonus to your AC instead of +2.
Tower Shield
Raw data
{
"name": "Tower Shield",
"level": 3,
"__prop": "subclassFeature",
"header": 1,
"source": "ValdaSpire24",
"entries": [
"While you are holding a {@item Shield|XPHB}, you have a +3 bonus to your AC instead of +2."
],
"className": "Craftsman",
"classSource": "ValdaSpire24",
"subclassSource": "ValdaSpire24",
"subclassShortName": "Armigers"
}