At 10th level, your superiority dice turn into d10s.
Improved Combat Superiority (d10)
Raw data
{
"name": "Improved Combat Superiority (d10)",
"page": 73,
"level": 10,
"__prop": "subclassFeature",
"header": 2,
"source": "PHB",
"entries": [
"At 10th level, your superiority dice turn into {@dice d10}s."
],
"className": "Fighter",
"classSource": "PHB",
"subclassSource": "PHB",
"subclassShortName": "Battle Master"
}