It's not cheaper than buying one (just like making magic items with Enchant an Item isn't cheaper than buying them); the advantage of a ritual scroll is that you don't need to be a ritual caster to use it and it's faster (casting time is half the normal casting time of the ritual), but the disadvantage is that you're paying the cost of a ritual book for a single use of a ritual (and you have to pay the component cost either way). It would cost 680gp for Sariel to make a scroll of Raise Dead (or buy one); to use it to raise one of the PCs would take another 5000gp of components, because we're paragon-tier PCs.If she can really scribe such a scroll, maybe she should ask for a loan?
Sariel is a very extreme case of a 'lazy warlord'; she has... two powers that attack directly (both because she didn't have any options that would have avoided that), low strength, only a +2 weapon, and no expertise. But she can grant melee and ranged attacks; I expect her default combat move is going to be Commander's Strike with Durn.The small party size may make the Warlord kinda gimped. Warlords tend to benefit from larger parties. Especially multiple melee types. We now have just Durn and the Warlord itself. I haven't gone over the Warlord's build, so maybe it's possible that this is a moot issue. I just know that Warlords tend to be less optimal in small groups.
Oh, I think I'm going to roll with what I've got.If the Warlord's player agrees, the PC can be re-built or even re-classed if desired.