Most UIs show a background color on each spell gem which indicates the target type:
Red - Single Target
Yellow - Self Only
Green - Targeted AOE (usually these are limited to 4 "hits" around and including your target)
Blue - Point Blank AOE (spell takes effect around the caster and anything in the blast radius gets hit. This can hit 100s of mobs at once)
Purple - Entire Group
Orange - Targeted AOE Rain (These function just like a Targeted AE, hitting 4 total times however it's spread out into waves every 2 seconds. So you can hit a stationary mob with 3 waves, or you can hit 4 stationary mobs with 1 wave each).
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