So basically this answer states:
[…] The War Caster feat says:
When a hostile creature’s movement provokes an opportunity attack from you, you can use your reaction to cast a spell at the creature, rather than making an opportunity attack. The spell must have a casting time of 1 action and must target only that creature.
The current text of Illusionist’s Bracers says:
While wearing the bracers, whenever you cast a cantrip, you can use a bonus action on the same turn to cast that cantrip a second time. […]
[…] So read Illusionist’s Bracers again, and it sure looks like this:
- On a creature’s turn, the creature provokes an opportunity attack from a war caster with Illusionist’s Bracers.
- The war caster casts a cantrip at the creature as a reaction.
- The Illusionist’s Bracers grants a bonus action to the war caster that can be used on that same turn.
- The war caster casts the cantrip again with that bonus action, not on the war caster’s turn. […]
Really my question is simply whether or not this is correct. If something would let you take a bonus action when it is not your turn, can you take that bonus action?