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 You miss nothing, the pathgrid field in spawn2 table is the one linking NPCs and pathgrids.You create a:
 - pathgrid (grid table)
 - you add waypoints to that grid (grid_entries )
 - you have to assign the pathgridID to a specifit NPC in the spawn2 table pathgrid frield.
 
 Make sure the pathgrid field isn't 0.
 
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