If I were the DM in this situation, I would restrict it to only cantrips with a casting time of 1 action, and disallow things like the examples you provided. In this dagger and club shillelagh scenario, would the shillelagh would have to be the main attack and the dagger the bonus action If you could use the shillelagh as the bonus action, it seems you could get your damage modifier (e.g., dex modifier because it is a finesse weapon) on the dagger attack and the Shillelagh modifiers on the bonus.
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, Steel Defender, or Homunculus Servant in need of repair. This interaction was clarified by 5e designer and 'official rules expert' Jeremy Crawford on 23 August 2014 in the following tweet exchange. Thankfully you can use Shillelagh and still use your Strength. How would you dip for this Is Magic Initiate a necessity Gogo. The biggest hurdle would be gaining access to both cantrips. Staff is a monk weapon and Shillelagh-able, so I see potential for that class. Obviously, the intent was for you to cast an attack cantrip, such as booming blade or fire bolt, but this ability has been worded poorly, and allows for any cantrip to be cast, including ones that normally have a casting time of "1 bonus action" or "1 minute". However, while the Attack action uses a d8 for damage per the Shillelagh spell, the bonus attack uses a d4 damage die per the Polearm Master feat. I've seen some really nice Shillelagh+GFB builds recently for paladins, tomelocks, even sorcerers. Ultimately a cantrip that turns a wooden spoon into a wisdom based flail is fine. My group has house ruled that you can only cast shillelagh on a Shillelagh. It simply states that "you can cast one of your cantrips". A shillelagh is very specific type of Irish walking stick/club that has nothing to do with the shillelagh. Notably, the Bladesinger's Extra Attack feature lacks any language that restricts what type of cantrip you can cast. It effectively limits your options to mostly just offensive cantrips. You can see that it specifies what type of cantrip you can cast, with the limitations of needing to have a normal casting time of 1 action, and also only targeting the creature that provoked the opportunity attack. The spell must have a casting time of 1 action and must target only that creature. 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. All-in-all I don't feel like you really get anything good out of shillelagh.Compare that phrasing to the third benefit of the War Caster feat (PHB, p. And casting shillelagh is a bonus action, which means you're not doing the other impactful things monks can do with bonus action, like making more attacks, or dashing (though you might be able to start the combat with it up if you were constantly casting it). Enhance Best Druid spells you should be using in DnD 5E Shillelagh (Cantrip). What shillelagh is actually useful for is Nature domain cleric or bard, as a supplement to their other. However, it utterly fails at this, and druid has no other option for a melee weapon spell that provides scaling damage. Certain aspects of the site uses the 5E SRD OGL content, D&D 5E SRD Document. The Druid spell Shillelagh can only be cast on a club or staff that you are currently holding but since it has a somatic component you cant cast it if you are. The spell is meant to work with a bludgeoning weapon. If you are trying to cast Shillelagh on a spear, that’s a bit of a stretch. This effect lasts until you cast the spell again or let go of the weapon.
If you had something important in your other hand and wanted to do more damage with your one-handed quarterstaff attacks, you're still better off just taking an ASI in Dex going from 1d6 to 1d8 increases average damage by one, but having +1 to your Dex mod gives +1 damage and +1 to hit, which is just better. On first glance it looks like it is intended to be a melee weapon using druid's at will damage scaling spell. Per the spell’s description, Shillelagh is cast on a club or quarterstaff that you are holding. DnD 5E restricts this cantrip to druids.To learn about an essential druid cantrip w. A quarterstaff already does 1d8 damage when wielded in two hands. A useful combat cantrip that can be cast as a bonus action is Shillelagh. Since you have Dex that's probably as good if not better than your Wisdom, getting to use Wisdom instead of Dex does nothing for you. Your extra martial arts attack and flurry of blows need to be unarmed strikes, so if you want to be impactful with those you need to have good Dex anyway. I really don't see this as a good use of a feat.