Sorry, yes, I have missed the āallā from that line.
I have updated my comment.
So for example Gravemaker attacks and gives burn status ailment to all enemies if you target the tank.
On defense if you have a Sif in the center, then Sif gives counterattack and mana generation buffs to all allies.
So some heroes will became much more powerful if you use them in these formations, while others are became less useful.
For example the normal version will became much better than the costume version for some recently released costumes if you use them as tank: eg: Boril, Cyprian
This is good, as it makes it the same as PvE for ānearbyā. It also gives a buff to those heroes, which, frankly, MOST of them need (Guinevere is the exception I can think of, but even she isnāt the terror she once was).
At least they appear to have fixed the mana mechanics on the W and M formations.
Last time that we saw formations, some of the positions shared the line of fire from a column of tiles. They split the damage, but both received a full tileās worth of mana; which was awful to combat. This time, no heroes share a column of tiles (as far as I could tell; I only tested a little bit).