I’ll try to explain what classes are needed so that any (high level) run goes as smoothly as possible, for something like grotto you don’t NEED all of these classes in your party setup but it still is helpful since it basically makes the DPS better. If you don’t have the right support classes then even the best DPS will only do a fraction of their potential damage in the instances.
Group 1 – “Support Group”
Tank – K/W (Needed for the Authoritative Deterrence debuff, causes 50% more dmg on boss for 3sec)
Healer – D/w, D/wd, D/s, p/k, p/s, p/r – generally priests are a lot weaker than druids for burn instances at endgame, d/wd has nice mdmg buff too, d/w has nice physical buff – ideally 1 d/wd and 1 d/w.
Support – M/Wl– one of the most important support classes. Gives 30% pdef/mdef reduction when flame or electrical explosion crits.
There are then 3 spots free for other classes. These can be occupied by DPS or other debuffer classes, i’ll post a few combos that can fill up the remainder of the spots.
Support – Ch/P – One of the best support classes, it provides 20% dmg boost. However, the person playing it needs a macro to swap to g2, cast buff, and swap back. Can also tank very well.
Support – K/P – Similarly to CH/P, it provides a nice damage boost. Macro required again. Also gives -25% aggro buff, and has combat res. Very nice for long tactical fights, especially as CD on dmg buff is low (1m30).
Support – WL/R – Has a nice skill to increase all elemental dmg on the target by a large factor. Not tested it properly so not sure if this actually works (?)
Support – D/R – provides a nice debuff that decreases crit res. Helpful for all instances where bosses have high crit resistance (some grotto, HoE, etc.)
Support/DPS -S/R- Provides some nice debuffs for physical classes. Can also do good burst dps with skills like snipe. Can be in g2 if it’s a good s/r too. S/wd and S/W also have similar debuffs, again they will probably be g2 dpsers.
Support – M/D– provides a nice magical defense debuff. Very good for a magical party, and one of my favourite support classes.
Group 2 – “DPS Group”
Support – Wl/M – One of the most important support classes. Has to be in the DPS group. Provides a number of good support skills, if played properly then it will increase the dps of g2 by a significant factor.
DPS – Wd/s – Provides a nice damage buff for all group 2 members. Can also do very good DPS, again pretty much a requisite unless you have insane DPS.
4x DPS slots – Any combo is fine as long as it does good enough dmg. Some good dps classes are : W/M, Wd/W, S/Wd, S/R, R/M, K/M, M/W, W/S, some more too but this is not a comprehensive list.
Now, an equally important part of raid setup :
SW Titles are just as important as the raid setup. If we don’t have any sw titles, then there is literally no point in even making a party – they are so important to a raid that you need all of them Ideally. They are :
Fire Training – increases casting speed and attack speed
Soldiers, Attack! – attack speed/cast speed and patt/matt
Midnight Ritual – debuff to boss defence
Tactical Smash – pdef debuff
You ideally need FT and SA in both groups. MR and TS should be applied by someone in group 1, so that the DPS in group 2 can use Ironblood Will (IBW) which increases their damage by 20% .
Equally as important, both group 1 and group 2 require someone to use a Tambourine (tamb) and Lute.
Tambourine increases the damage of all party members, Lute increases attack speed.
Alternatively, if for some reason you have mages in group 2 (really?) then you can use a guitar too which increases casting speed. However, i’ve never seen this in my entire time playing ROM so in general just use a lute, it will keep the physical dps and w/m’s happy.
That’s all, i think. As mentioned earlier, this is just an outline, and there is no 1 system that works best, as it really depends on your dps in g2. If it’s physical then there is no point in taking an m/d for example. Additionally, for an ini like Grotto you do not need all of this, it just makes it go smoother.