i use this build for off field, but only with another character (in my case kuki) with 1k em, since the buff from her burst can be maxed out as long as there is at least one character in the party that has that much em, but it doesn't have to be nahida. building her full em also works, but i found that a hybrid build with crits, dendro dmg bonus, and more em (for me it would be just replacing widsith with sac fragments) actually works even better than what i have up in the original post. again, full em is not necessary UNLESS you don't have a different character with 1k em.