Visual and balance changes to brimdust sacks and rush glands (#93323)

code/game/objects/effects/particles/brimdust.dm

@@ -0,0 +1,17 @@
+/particles/brimdust
+	icon = 'icons/effects/particles/generic.dmi'
+	icon_state = "cross"
+	width = 100
+	height = 100
+	count = 1000
+	color = "#88304e"
+	spawning = 3
+	lifespan = 0.7 SECONDS
+	fade = 1 SECONDS
+	velocity = list(0, 0)
+	position = generator(GEN_CIRCLE, 0, 16, NORMAL_RAND)
+	drift = generator(GEN_VECTOR, list(-0.2, 0), list(0.2, 0))
+	gravity = list(0, -0.5)
+	scale = generator(GEN_VECTOR, list(0.3, 0.3), list(1,1), NORMAL_RAND)
+	rotation = 30
+	spin = generator(GEN_NUM, -20, 20)

code/game/objects/effects/temporary_visuals/miscellaneous.dm

@@ -245,8 +245,10 @@
 		setDir(mimiced_atom.dir)
 		mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 
-/obj/effect/temp_visual/decoy/fading/Initialize(mapload, atom/mimiced_atom)
+/obj/effect/temp_visual/decoy/fading/Initialize(mapload, atom/mimiced_atom, start_alpha)
 	. = ..()
+	if (start_alpha)
+		alpha = start_alpha
 	animate(src, alpha = 0, time = duration)
 
 /obj/effect/temp_visual/decoy/fading/threesecond