My recollection of LoS (for PvE), is that it varied based on the outdoor/indoor status of a zone.
For example outdoor zones, you shouldn't require line of sight to cast detrimental spells on mobs. This is why you could pull through walls and why you could get nuked to hell in Unrest.
Also that is why you didn't have to worry about hills or trees like you do on P99.
But indoor zones required LoS for detrimental spells. The exception to this being something like a Mage bolt.
But again, getting proof on this is tough.
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