Artillery

Weapon skill · Monster Hunter Wilds · max level 3

Strengthens explosive attacks like shells, Wyvern's Fire, charge blade phial attacks, and Sticky Ammo.

Levels

When: Shelling, Wyvern's Fire, Charge Blade impact phials, Sticky Ammo

Lv	Effect	In numbers
1	Impact phial and Sticky Ammo damage ×1.10, shell and Wyvern's Fire damage about +5%, Wyvern's Fire recharges ×1.2 faster. Shelling fire attack +30.	Shelling fire attack +30 Impact phial / Sticky Ammo damage ×1.10 Shell and Wyvern's Fire damage about +5% Wyvern's Fire recharge ×1.2 (likely)
2	Impact phial and Sticky Ammo damage ×1.20, shell and Wyvern's Fire damage about +10%, Wyvern's Fire recharges ×1.5 faster. Shelling fire attack +60.	Shelling fire attack +60 Impact phial / Sticky Ammo damage ×1.20 Shell and Wyvern's Fire damage about +10% Wyvern's Fire recharge ×1.5 (likely)
3	Impact phial and Sticky Ammo damage ×1.30, shell and Wyvern's Fire damage about +15%, Wyvern's Fire recharges ×2.0 faster. Shelling fire attack +90.	Shelling fire attack +90 Impact phial / Sticky Ammo damage ×1.30 Shell and Wyvern's Fire damage about +15% Wyvern's Fire recharge ×2.0 (likely)

Gunlance, Charge Blade (impact phials) and bowgun Sticky Ammo only; Switch Axe phials, element-phial CB and Bow are not affected.
SkillData [5, 120, 3, 110] / [10, 150, 6, 120] / [15, 200, 9, 130]: gunlance damage %, Wyvern's Fire speed factor (most likely the recharge; untested), shelling fire (true), phial / Sticky Ammo multiplier. game8 measured Wyvern's Fire 76 -> 80 -> 84 -> 89 at Lv0-3.

Source: Datamine SkillData [2] = shelling fire true 3/6/9, [3] = explosive ×1.10/1.20/1.30; in-game text and game8 agree.

Where to get it

Decorations

Artillery Jewel [1] Lv 1 rarity 3
Artillery Jewel II [2] Lv 2 rarity 4
Artillery Jewel III [3] Lv 3 rarity 5

Weapons with it built in (9)

Charge Blade

Shrouded Kutharja (Lv 1), Vankrom Blade (Lv 2), Chata Strongarm IV (Lv 1), Lagia Storm I (Lv 2), Chata Strongarm III (Lv 1), Chata Strongarm II (Lv 1)

Light Bowgun

Ajara-Angaja (Lv 3), Ajara Shellgun II (Lv 3), Ajara Shellgun I (Lv 2)