Allow Aether Breach casts to stack (but not happen any faster)

This has really bad antisynergy with the CD reduction in Aether Avatar otherwise.

game/modules/tome/data/talents/spells/aether.lua

@@ -182,6 +182,7 @@ newTalent{
 		local damage = t.getDamage(self, t)
 		return ([[Rupture reality to temporarily open a passage to the aether, triggering %d random arcane explosions in the target area.
 		Each explosion does %0.2f arcane damage in radius 2, and will each trigger at one turn intervals.
+		Subsequent casts will stack but the explosions will still only occur once per turn and will be centered at the last area targeted.
 		The damage will increase with your Spellpower.]]):
 		format(t.getNb(self, t), damDesc(self, DamageType.ARCANE, damage))
 	end,

game/modules/tome/data/timed_effects/magical.lua

@@ -2633,7 +2633,7 @@ newEffect{
 newEffect{
 	name = "AETHER_BREACH", image = "talents/aether_breach.png",
 	desc = "Aether Breach",
-	long_desc = function(self, eff) return ("Fires an arcane explosion each turn doing %0.2f arcane damage in radius 1."):format(eff.dam) end,
+	long_desc = function(self, eff) return ("Fires an arcane explosion each turn doing %0.2f arcane damage in radius 2."):format(eff.dam) end,
 	type = "magical",
 	subtype = { arcane=true },
 	status = "beneficial",
@@ -2650,6 +2650,14 @@ newEffect{
 
 		game:playSoundNear(self, "talents/arcane")
 	end,
+	on_merge = function(self, old_eff, new_eff)
+		new_eff.dur = new_eff.dur + old_eff.dur
+		if old_eff.particle then game.level.map:removeParticleEmitter(old_eff.particle) end
+		new_eff.particle = Particles.new("circle", new_eff.radius, {a=150, speed=0.15, img="aether_breach", radius=new_eff.radius})
+		new_eff.particle.zdepth = 6
+		game.level.map:addParticleEmitter(new_eff.particle, new_eff.x, new_eff.y)		
+		return new_eff
+	end,
 	activate = function(self, eff)
 		eff.particle = Particles.new("circle", eff.radius, {a=150, speed=0.15, img="aether_breach", radius=eff.radius})
 		eff.particle.zdepth = 6