Lexarius
Goblin Squad Member
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On casting times and targeting templates, I would hope that you'd activate the ability, spend some time casting, during which an obviously magical animation plays, probably breaking stealth if applicable. People with the Spellcraft skill would be able to tell what you're doing and how long it will take. At the end of the casting time, the area template appears under your mouse and you can press a button to fire or cancel the spell. Most spells would need to be fired within a certain amount of time or fizzle, or you'd end up with groups of wizards standing around chokepoints with all of their magical doom preheated and waiting for someone to walk through.
On AoEs vs. Formations, you might differentiate a few different kinds of AoEs and the formation tactics that would work best against each. If your formation has shieldbearers, a turtle formation would work well against a rain of arrows or (potentially) effects that are directional in nature like dragon breath. On the other hand, if all you've got are swordsmen and spearmen and nobody's got shields equipped, being clustered would probably make things worse (unless you want a "human shield" mechanic). On the other other hand, there's probably not much defense against a grenade-like effect other than scattering, assuming that it hits where the caster wants it to hit. Fireball is described as starting off as a bead-like projectile that detonates early if it hits something, so a shield wall might be of use against it (ranged touch attack vs. openings between shields). Flame Strike, on the other hand, is just a column of holy death wherever the caster wants it.