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ForsakenGod wrote:... How would a sisters of battle army take down a land raider?

Dominions can take up to four meltaguns themselves, with a Combi-melta on the VSS if you take one with that squad as well. That is usually more than enough to take down a LR. Either DSing Seraphim or just moving them normally into range of their up to three possible (with two of them twin-linked) Inferno Pistols also works. Exorcist tanks can damage a LR as well and at range, but that's really not a good use of Exorcists unless you have absolutely nothing else to shoot at. Retributior Squads can take Multi-meltas if you want them, but they are fairly pricey point-wise, and compete with Exorcist tanks for HS slots.

Anyway, as was said before, any other SoB squad can generally take up to two meltaguns which with BS 4 are quite good. But otherwise just ignore a solo LR and worry about killing their Troops or the LR's cargo if it has unloaded already.

If you were playing apocalype and wanted to ally gk with sisters then you could field a gk lr from the daemonhunters codex. Thats the only way the armies can ally really. I would suggest waiting for the new codex whenever its released before you start your army. Nearly all the models have been withdrawn atm anyways.

ForsakenGod wrote:Well heres a question, Buddy of mine thats learning the game alone with me is fielding a land raider with his space marine force .... How would a sisters of battle army take down a land raider?

Sisters can have melta weapons all over the place.

ForsakenGod wrote:really ... normal meltas not multi meltas are good can openers?

The only difference in armour penetrating ability between a meltagun and multi-melta is range.

There's also a unit known as "Retributors" (heavy FOC) that can have 4 multimeltas and an Immolator (also can have TL multimelta on it) so that unit has plenty of anti-armor usage. And the Immolator can be an FOC choice by itself.
So, don't worry about Sisters v armor vehicles they have plenty of options to deal with it.