Pretty much, anyone who played RS3 or OSRS long enough must know it. It's involved as one of the either most profitable or most expensive skill-related thing ing - depends on how you gather them.
This minigame of Hunter skill could require basic quest of gathering certain items around Emps-World, for example: Wizard hat, Apprentice Wand and perhaps, other beginner level item that can be easy to obtain, Up to community feedback to decide that one. This way you could turn butterfly jars to impling jars(1000gp per inventory).
Area where it could be located is north-east of Rimmington Teleportation area(has no use whatsoever).
Impling that can be caught inside field with butterfly net and impling jar would be:
Baby
Young
Gourmet
Earth
Essence
Eclectic
Nature
Magpie
Ninja
Dragon
For loot table:1)Baby:
Common: Soft Clay(1 - 20 noted), Flax(1 - 20), Rune Essence(1 - 50).Uncommon: Chisel, Knife, Eye of Newt(1 - 25), Unicorn Horn Dust(5 - 15).Rare/Very Rare: Clue Scroll(easy/medium), Sapphire Necklace.2)Young:
Common: Soft Clay(10 - 25 noted), Flax(10 - 50), Rune Essence(10 - 70).Uncommon: Magic Shortbow, Rune Scimitar, Rune Dagger, Adamant Hatchet, Clue Scroll(easy/medium).Rare/Very Rare: Right/Left Shield halves, Emerald Ring.3)Gourmet*:
Common: Trout/Salmon(10 - 50).Uncommon: Lobster, Apple/Meat/Redberry Pie(20 - 40).Rare/Very Rare: Monkfish(30 - 60), Shark/Sea Turtle/Manta Ray(25 - 50), Clue Scroll(medium).4)Earth:
Common: Tine/Copper/Iron Ore (25 - 60).Uncommon: Coal/Mithril ore(15 - 40).Rare/Very Rare: Runite/Adamantite ore(10 - 30), Clue Scroll(medium).5)Essence:
Common: Fire/Aire/Earth/Water(50 - 250).Uncommon: Chaos/Cosmic/Law/Nature(20 - 70).Rare/Very Rare: Death/Blood/Soul/Astral(30 - 50), Clue Scroll(medium/hard).6)Eclectic:
Common: Soft Clay(50 noted), Bowstring(10 - 35), Rune Pickaxe, Rune Hatchet, Rune Med Helm.Uncommon: Casket(with uncuts and kits), Gold Bar(10 - 40).Rare/Very Rare: Clue Scroll(medium/hard), Right/Left Shield halves(1 - 4).7)Nature:
Common: Guam/Marentill/Tarromin/Harrandler(10 - 30), Acorn/Willow seed(1 - 10).Uncommon: Irit/Avantoe/Ranarr/Toadflax/Kwuarm(5 - 25), Maple/Yew/Magic seed(1 - 10).Rare/Very Rare: Cadantine/Snapdragon/Lantadyme/Torstol/Dwarf Weed(1 - 20), Spirit Seed(1 - 10) Clue Scroll(hard), Right/Left Shield halves.8)Magpie:
Common: Soft Clay(1 - 20 noted), Flax(1 - 20), Rune Essence(1 - 50).Uncommon: Magic Logs(10 - 35), Mithril/Adamant Bar (10 - 40).Rare/Very Rare: Clue Scroll(hard/elite), Right/Left Shield halves, Amulet of Glory(1 - 10).9)Ninja:
Common: Green/Blue/Red Dragonhide(5 - 20), Rune Chainbody, Rune Battleaxe, Rune full helm, Rune Kiteshield.Uncommon: Potato Cactus(1 - 15), Jangerberries(1 - 15), Ground Mud Rune(5 - 20), Mort Myre Fungus(1 - 20), Crushed Nest(1 - 15).Rare/Very Rare: Clue Scroll(hard/elite), Dragon Haldberd, Dragon Spear, Dragon Dagger, Right/Left Shield halves.10)Dragon:
Common: Baby Dragon Bones(20 - 70), Dragon Bones(50 - 100), Dragon Arrows(150 - 300), Dragon Dart(20 - 50).Uncommon*: Dragon arrowtips(50 - 200), Dragon Dart tips(40 - 80), Uncut Dragonstone(5 - 20), Scaled Dragon Dust*(10 - 40).Rare/Very Rare: Clue Scroll(elite), Dragon Chainbody, Dragon Scimitar(1 - 2), Right/Left Shield halves(1 - 5).*Gourmet loot could be both raw/cooked food.
*Dragon Impling giving dragon arrowtips/dart tips can also be added to daily tasks.
*Scaled Dragon dust could be ingredient for prolonged antifire effect with antifire potions making them as Extended Antifire Potions(uses 5 per potion).
- Higher amount of loot should be more rare to obtain.
Source:
http://oldschoolrunescape.wikia.com/wiki/Impetuous_Impulses