Reaction (proficiency bonus times per long rest):
When a creature you can see moves while it is touching water, blood, mud, corpses, or difficult terrain created by environmental effects, you may reduce its speed to 0 until the end of the current turn.
You may mark a corpse with Tidebound signs as an action. A marked corpse cannot be moved by nonmagical means for 1 hour.
Drawback
Corpses left unmarked in your vicinity are treated as negligence.
Tidebound agents will question your reliability if patterns emerge.