The Bladesigner Wizard's Extra Attack feature reads:

You can attack twice, instead of once, whenever you take the Attack action on your turn. Moreover, you can cast one of your cantrips in place of one of those attacks.

Notably, all but three cantrips have a casting time of 1 Action. Two cantrips, shillelagh and magic stone, have a casting time of 1 Bonus Action, and the cantrip mending has a casting time of 1 minute.

Can these cantrips be cast with the Bladesinger's Extra Attack feature, despite not having casting times of 1 Action? And particular to mending, does it take effect immediately, or does it still take a minute to complete casting?

(Nevermind how our Wizard learned shillelagh or magic stone, perhaps they took a 1 level dip into druid when they went hiking during a gap year in their studies.)


Yes, you can.

Compare to the Warcaster feat:

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.

You can see that it specifies what type of Cantrip you can cast with the limits of "It must have a normal casting time of 1 Action, and also must only target [the creature that provoked the Opportunity Attack]." It effectively limits your options to mostly just offensive Cantrips.

Notably, the Bladesingers Extra Attack feature lacks any language that restricts what type of Cantrip you can cast. It simply states that "you can cast one of your Cantrips". Obviously, the intent was for you to cast an attack Cantrip, such as Booming Blade or Firebolt, but this ability has been worded poorly, and allows for any Cantrip to be cast, including ones with a normal cast time of 1 Bonus Action or 1 Minute.

In the case of Mending, it should go into effect immediately, although the benefits of casting Mending in the middle of combat are few, unless you have an Artificer ally with an Eldritch Cannon in need of repair.

If I were the DM in this situation, I would restrict it to only cantrips with a cast time of 1 Action, and disallow things like the examples you provided. I would still allow non-offensive Cantrips as I like to reward creative uses of spells.

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    \$\begingroup\$ Notably the mending cantrip doesn't have to be mid-combat. Simply take the Attack action outside of combat for an instant mending. It also may help to compare the Extra Attack feature to features that do restrict what types of spells/cantrips they use \$\endgroup\$ – Medix2 Dec 29 '20 at 18:39
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    \$\begingroup\$ @Medix2 I just figured out why slamming a TV with your bare fists will fix it... \$\endgroup\$ – Erik Dec 29 '20 at 18:40
  • \$\begingroup\$ Why would you stop bonus action cantrips? They are closer to 'half action' in speed than full action cantrips, and the power makes no mention of cast time at all. Though I can understand why mending is an odd one out. \$\endgroup\$ – SeriousBri Dec 29 '20 at 19:14
  • \$\begingroup\$ @Medix2 Outside of combat, time is usually much less of a constraint. 3-4 minutes spent casting Mending vs 3-4 rounds will hardly make a difference. \$\endgroup\$ – RevanantBacon Dec 29 '20 at 19:21

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