Instead of initiating a Cohort, you can perform a ritual over the course of 8 hours, which can be done during a Long Rest, to animate an Undead Cohort. Choose its stat block: Corporeal Undead or Incorporeal Undead. You also choose what kind of Undead it is, such as a zombie or ghost, appropriate for the stat block.
Undead Cohort
Raw data
{
"name": "Undead Cohort",
"level": 3,
"__prop": "subclassFeature",
"header": 1,
"source": "ValdaSpire24Extras",
"entries": [
"Instead of initiating a Cohort, you can perform a ritual over the course of 8 hours, which can be done during a {@variantrule Long Rest|XPHB}, to animate an Undead Cohort. Choose its stat block: {@creature Corporeal Undead|ValdaSpire24} or {@creature Incorporeal Undead|ValdaSpire24}. You also choose what kind of Undead it is, such as a zombie or ghost, appropriate for the stat block."
],
"className": "Captain",
"classSource": "ValdaSpire24",
"subclassSource": "ValdaSpire24Extras",
"subclassShortName": "Skull Banner"
}