At 10th level, you add the polymorph spell to your spellbook, if it is not there already. You can cast polymorph without expending a spell slot. When you do so, you can target only yourself and transform into a beast whose challenge rating is 1 or lower.
Once you cast polymorph in this way, you can't do so again until you finish a short or long rest, though you can still cast it normally using an available spell slot.
{
"name": "Shapechanger",
"page": 119,
"level": 10,
"__prop": "subclassFeature",
"header": 2,
"source": "PHB",
"entries": [
"At 10th level, you add the {@spell polymorph} spell to your spellbook, if it is not there already. You can cast {@spell polymorph} without expending a spell slot. When you do so, you can target only yourself and transform into a {@filter beast whose challenge rating is 1 or lower|bestiary|challenge rating=[&0;&1]|type=beast|miscellaneous=!swarm}.",
"Once you cast {@spell polymorph} in this way, you can't do so again until you finish a short or long rest, though you can still cast it normally using an available spell slot."
],
"className": "Wizard",
"classSource": "PHB",
"subclassSource": "PHB",
"subclassShortName": "Transmutation"
}