D&D 5E - Blade Ward cantrip

Uh, not sure how your houserule is any better. If they take any damage the spell is finished, so the instant they get hit, which is likely, the spell ends and they take normal damage from there on out. I can personally see a good use of this if there were a large number of attacks. Say you're being attacked by 5 bandits with light crossbows. They have a +3 to hit, and since you're a wizard, you only have about a 12 armor class. They'll hit you 55% of the time. This will deal over one round 13.75 damage. If you take dodge, your AC is essentially increased by 5, so you'll have a 17 armor class and they'll hit you only 30% of the time for damage of 7.5 damage. If you have resistance to all damage, you'll only take 6.88 damage, which, while a marginal decrease, only becomes better the more people are added. Not to mention dodge doesn't work if you can't see someone, so if you're running away you'll be taking the full damage, and if one of them grabs you after that you're a goner. This is basically little more than a delaying spell, which, as it is a cantrip, isn't really that bad.

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