A spike formation?
I think post 100.. could be something like this?
Spartan - Maniac - LK
N.Vik - Pirate - Prophet
D.a/Monk - Exo - Monk
Spartan for a sword, LK for LS
Pirate instead of Arty, N.Vik for ridge
Not fond of the double monk, since you'll need certain mercs for a really nice spike build.
Of course, spartan's raw attk power is enough to crack down a front line fast.
Pirate obvious reasons.
I'd choose either Da or Prophet- Since your running no healer, Prophet (especially with 5 melee)
Could ultimately toss D.A for another monk if you so choose.
Only bad thing to this is you'll be susceptible to scrolls with one range.
Never tried that formation but seems like it could work o.o