Zombies also has some good ideas like the new death mechanic but once again, its execution could be a lot better. (gametactics.com)
On normal there doesn't seem to be any instant death mechanics or hard to explain elements. (justpushstart.com)
When starting Fire Emblem Warriors, you have a choice between «Classic» mode, which says it features the telltale permanent death mechanic from the mainline games, or the more forgiving «Casual» mode, where characters don't leave the game forever after dying in battle, just like the option from the more recent 3DS Fire Emblem games. (egmnow.com)