Guidance is a great choice, obviously.
Is it tho?
When you have Friends you can only concentrate on one of them ... its good tohave options ofc ... its just not as good as it may seem.
But I would also consider acid splash for the surface effects.
Im affraid cantrips dont make surface effects on their own ... they only react to whatever target is standing in.
Then there's shocking grasp. It's not that great but it does offer lightning damage, which synergizes with water, and it provides safe disengagement on top, in case you can't EB punt a target away.
IMHO Shockung Grasp is best meele cantrip ...
It gives fair dmg, advantage on metal-armoured targets, and it disable reaction!!!
That mean much more than safe disengage ... you can for example disable counterspell to enemy Wizard!
It would be much more appealing if you could deliver it trough your companion tho.
And then there's thaumaturgy for the dramatically inclined. It might seem like overkill but if you really want to make your intimidation checks then 20 cha, guidance, proficiency, and thaumaturgy all combined really ought to do it.
Dont Thaumaturgy also require concentration?
And then of course there's light, in case you just like to be able to see in the dark without darkvision.
Indeed.
//Edit:
Anyway ... since Ritual casting seems to be missing, i think pact of the Tome loose lots of its appeal.
