Does Dawn cylinder go through walls and floors?

Echo Knight’s opportunity attack: if I’ve got a weapon with reach, would that mean I can do this attack from 10ft away?

Is the Echo Knight’s echo constrained by the Echo Knight’s available movement modes?

Question about the Echo Knight, can you switch places with the echo if you are using the echo avatar feature?

Artificer: Is the Infused Items column the MAX infusions you can have active at one time?

When casting Temporal Shunt at 6+, if one of the additional creatures is concentrating on a spell, are they able to maintain concentration through time?

Can Dragon’s Breath be Twinned since it only “targets” one creature?