If you've been playing Nintendo's Fire Emblem Heroes [Free] for any length of time, you surely know the pain of a terrible 20-orb draw. You end up with a bunch of heroes you have no use for, and there's nothing to do with them but send them home for a meager amount of Hero Feathers. To address that problem, Nintendo has added a new system to the game called Skill Inheritance, which allows you sacrifice a unit to teach its skills to another unit. There are only a few restrictions, so you can theoretically create some very powerful units if you have the right stock to work from.
There's the rub, though. One of the nice things about Fire Emblem Heroes is that, so far, the gap between free players and paying players in the Arena mode hasn't been terribly wide. Because of the way matchmaking works, if you're stuck without any five-star units, you should still be able to find a reasonable opponent. At the moment, the game simply compares the stats of your team against the stats of the opponent's team. Sure, there are some cracks in the system, like tiny gods Takumi and Linde, but given the low probability of pulling specific heroes, you'd have to spend a great deal of money to guarantee getting those particular characters. More importantly, there are always ways of handling specific problem cases by using other characters.
The Skill Inheritance system up-ends the existing order. In its current form, it's extremely powerful, allowing you to teach up to three skills from one character to another. The sacrificed unit does not need to be of the same rarity level, so four-stars can feed a five-star hero quite nicely. On top of that, the sacrificed unit doesn't even have to have learned the skill yet, so you can dump your summoning fodder directly into the grinder. While there are a number of skills that cannot transfer, you can put together some very interesting combinations. For example, you could feed a four-star Lon'qu to Hector to pass on his Vantage 3 passive skill, a...