Detect magic (drows) and invisibility (spells)
70343
What happens when Detect Magic is used upon something that is magically invisible?
90723
How to tell if a certain item is in a player inventory?
110911
Does a passive Perception (Wisdom) check add WIS mod + Perception skill?
68498
How would a mute wizard cast spells?
120009
How does line of sight for spells work, accounting for familiars?
104824
How do i testfor a item a player is holding?
87888
Can an illusion give a player partial cover?
29905
How exactly does the Dispel Magic spell work with multiple effects?
30110
How to roll perception checks for characters who aren't actively looking without arousing suspicion?
73468
How to handle Sunlight Sensitivity (of Drow, etc.), especially for casters?
117386
Test if player has specific item in specific hotbar slot [1.8]
90190
/testfor for item enchantment
55405
How can I tell how many damage dice to roll for an NPCs cantrip?
22088
Idle Detection in WPF
133539
Are Casting Foci Magic Items?
144503
How can I check if a scrollbar is visible?
41225
How loud/obvious is a wizard casting a spell?