Though there's only two combination attacks in the game, they're very powerful, and can only be used under these conditions:
- All pilots participating must have enough EN and Will to use the attack. Both combination attacks cost 60 EN and require the pilot's Will to be 120 or higher.
- All units involved in the attack must be either side by side, or in a space diagonally away from one of the other unit. For the R-Formation, however, 2 units can be side by side, with the other at a diagonal from either unit.
- The target enemy must not be more than 4 spaces away, as both attacks have a range of 1-4. If Excellen or Rai use the Snipe skill, however, the range increases to 1-6.
- A combination attack can be used multiple times in one turn, as long as each pilot has enough EN and Will to do so.
For Rampage Ghost, Kyosuke must be piloting the Alteisen and Excellen must be piloting the Weisritter, along with meeting the above conditions.
For R-Formation, Ryusei must be piloting the R-1, Rai must be piloting the R-2 Powered, and Aya must be piloting the R-3 Powered, along with meeting the above conditions.
For each combination attack, they won't show up on the weapon customization screen for the units involved. However, this doesn't mean their damage output can't be increased. In fact, it's quite the opposite, as they can become exceedingly powerful.
For Rampage Ghost, upgrading the Alteisen's Revolver Stake and the Weisritter's Oxtongue RifleD will increase its power. Its maximum power is a whopping 8175.
In comparison, the Grungust's Darkness Slash has a maximum power of 6900. Furthermore, the SRX's TK BurstSlash, one of the most powerful moves in the game, only reaches a maximum power of 8100, making Rampage Ghost one of the best moves in the game, if not the best.
Economically, however, it's not very likely you're going to be using the full power of Rampage Ghost (or most attacks, really) unless you're on a New Game+. A big reason being that the Weisritter's Oxtongue RifleD costs the same amount to fully upgrade as the SRX's TK Burstslash (which is more powerful)--$357500. Though the Alteisen's Revolve Stake only costs 275000 to fully upgrade, it's overall more efficient to upgrade other weapons and mechs than to put that amount of money into those weapons for a full powered Rampage Ghost. In spite of this, upgrading Rampage Ghosts' damage output, even if not upgrading it fully, will ensure it's one of your best attacks, still comparable to a Super Robot's.
For R-Formation, you must upgrade the R-1's T-LinkKnuckle, the R-2 Powered's Hi-Zol Launcher, and the R-3 Powered's Strike Shield. Though the maximum power isn't quite as high as Rampage Ghost, it tops out at a respectable 7840.
In comparison to other attacks, it, like Rampage Ghost, can be easily compared to a Super Robot's attack. Though not as strong, at its peak, it does indeed outdamage the Grungust's Darkness Slash.
Economically, upgrading the R-Formation is the antithesis to Rampage Ghost. Rampage Ghost's damage is a dream come true, and really worth the money you'll put into it. R-Formation, on the other hand...it's a nightmare. You'll be putting so much money into it: a grand total of 907,500. That's a real letdown compared to Rampage Ghost's cost of 632,500. Especially when Rampage Ghost outdamages R-Formation by 335. On top of this, upgrading the R-1's T-LinkKnuckle is inefficient. You should upgrade a Steel Knife fully, providing a very reliable, very cost efficient weapon. That is, until you get the Shishioh Blade, an extremely powerful melee weapon which suits Ryusei perfectly, and should be upgraded. On top of this, when both are at their base power, the Shishioh Blade will outdamage the T-LinkKnuckle by 500, with the same being true when both are fully upgraded.
Overall, both Rampage Ghost and R-Formation are excellent moves, regardless of those intimidating numbers I provided. Just don't expect to upgrade either of them completely until you're on a New Game+. When you do, focus first on Rampage Ghost, and you'll definitely be pleased.