Add Shield to your spellbook for free. When you fail a saving throw, you can cast Shield without a spell slot. If you do so, you have a +5 bonus to saving throws for the duration, including against the triggering save, potentially turning it into a success.
Once you use this feature, you can't use it again until you finish a Short or Long Rest. You can also restore your use of it by expending a level 3+ spell slot (no action required).
{
"name": "Warding Shield",
"level": 10,
"__prop": "subclassFeature",
"header": 2,
"source": "ValdaSpire24Extras",
"entries": [
"Add {@spell Shield|XPHB} to your spellbook for free. When you fail a saving throw, you can cast {@spell Shield|XPHB} without a spell slot. If you do so, you have a +5 bonus to saving throws for the duration, including against the triggering save, potentially turning it into a success.",
"Once you use this feature, you can't use it again until you finish a {@variantrule Short Rest|XPHB|Short} or {@variantrule Long Rest|XPHB}. You can also restore your use of it by expending a level 3+ spell slot (no action required)."
],
"className": "Wizard",
"classSource": "XPHB",
"subclassSource": "ValdaSpire24Extras",
"subclassShortName": "Wand"
}