You can cast it through an illusory wall, though if you don’t know that it is illusory, you probably shouldn’t risk it. Because the spell launches a bolt of force, and not anything physical, it will not swing the door open, and while closed, it is total cover.
Can familiars cast spells on their turn?
Yes, although many spells still need line of sight, so it is very spell description dependent. Because using the familiars senses uses your action, if you are casting on the next turn, it would be unlikely you could target a moving creature.
Can you cast spells through glass?
There’s a official sage advice podcast with Crawford where he states glass provides total coverage. So unless the spell specifically states (sacred flame) that cover doesn’t effect the spell, you can’t cast through glass.
How does the wall of fire spell work?
One side of the wall, selected by you when you cast this spell, deals 5d8 fire damage to each creature that ends its turn within 10 feet of that side or inside the wall. A creature takes the same damage when it enters the wall for the first time on a turn or ends its turn there. The other side of the wall deals no damage. At Higher Levels.
Can a spell caster see inside a wall of fire?
A DM could quite reasonably rule that grappling, shoving, and making melee attacks with some weapons (short ones) constitute “entering the wall”, and impose damage in those cases. Any spells that target a creature or point that the caster can see cannot target inside the wall of fire.
Can a spell be cast through a wall of force?
A wall of force blocks magic by granting total cover. Although this is an old question, I discovered a relevant ruling while researching another question, and would like to add it here for completeness. D&D 5e designer Jeremy Crawford, whose rulings are considered official, confirms in a tweet that wall of force provides total cover:
Can a spell affect a creature outside the wall?
Spell effects extend through the wall (the description of wall of fire doesn’t say that they don’t), so spells that affect an area that originate from outside the wall can affect creatures inside it normally. Note that many spells that are attacks (for example, fire bolt ), don’t target a creature the caster can see, just one within range.
