Steam Behemoth (Dragon Slayer)

Homebrew

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Traits

Mech. This creature is a piloted Construct uses its pilots languages, is insulated against effects and due to its heavy armour is hard to damage with conventional weapons.

High Tech Machine. This machine is high tech and has extra resistance to Magic. It has Advantage against Magical effect, can choose to succeed a Saving Throw against a magical effect once per turn and if a spell is cast within 20 feet it rolls a d6 , on a 5 or 6 it disrupts the spell.

Radio Hub. Can communicate and serve as a radio hub in a 1000 km radius.

Underwater Walker. This robot is so massive and waterproof it can walk on the bottom of the sea.

Anti-Magic Field. All Magic is disrupted unless a Power Die is used and all summoned beings are returned to their plane in a 20 ft radius.

Dragon Slayer. The Behemoth has Resistance to all Draconic breath weapon attacks.

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Actions

Multi Attack. Makes 2 arm weapon attacks, 1 shoulder attack and can make an extra melee attack

Arms
Steam Cannon. Range 300/1200, Fires a steam powered round, 1d20+17 , on hit 2d10+10 bludgeoning damage, Strength Saving Throw DC25, on failure the creature is knocked prone and pushed 10ft away from the target location. Add a Shell effect from below:

• Explosive Shell: Add 6d6+10 Force damage in a 15ft radius, Dexterity Saving Throw DC22 for half damage, make the prone save with disadvantage and adds 10ft to the push.
• Dragon Slayer: Add 6d6+10 Force damage, against a Huge or larger flying creature: Strength Saving Throw DC25, on failure the creature is Restrained. The creature must succeed an Athletics Check DC30 to break free.
• Anti-Magic Shell: Dispels all magic effects in a 30 ft radius, [Spell casting MOD] Saving Throw DC25, auto fails when the creature is not a spellcaster. Stays for 1 round and can be ignored with 1 Power Die.
• Electrical Shell: Add 6d6+10 Electrical damage in a 15 ft radius, Dexterity Saving Throw DC22 for half damage

Steam Repeater Gun. 60 ft Cone Dexterity Saving Throw DC20, on failure 8d6 Piercing/Bludgeoning damage, on success half damage, takes 1 turn to reload.

Shoulder
Tesla Coil. Line 120 ft, all creatures make a Dexterity Saving Throw DC22, on failure 8d6 Lightning damage, takes 1 turn to reload. Constitution Saving Throw DC22 or be stunned for 1 round.
Shoulder Cannon. 1d20+17 , on hit 2d10+10 Piercing/Bludgeoning damage.
Harpoon Gun. 1d20+17 , on hit 2d10+10 Piercing damage, Strength Saving Throw DC25 or get dragged to the creature. Any flying creature gets grounded until they make the save.

Below Actions can be used once and recharge on a 5 or 6 on a 1d6
Las Repeater Cannon. In a 60ft cone DEX Save DC22, on failure half damage, 20d6 Radiant damage, takes 1 turn to reload.
Tesla Coil. in a line 300 ft DEX Save DC22, on failure half damage, 20d6 Electrical damage, takes 1 turn to reload.

Melee
Melee attack. 1d20+17 , on hit 2d10+10 Slashing/Bludgeoning damage, Strength Saving Throw DC25 or get knocked prone.
Kick attack. 1d20+17 , on hit 1d10+10 Bludgeoning damage, Strength Saving Throw DC25 or get knocked prone and fly 15 ft from the creature.

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Bonus Actions

Electrify hull. send an electrical charge through the hull to knock out any creature on top of the mech. Constitution Saving Throw DC20, on failure the creature falls prone next to the mech, on success nothing happens.   Search Light. The searchlight can be rotated by using a Bonus Action. It emits a 120 foot Cone of bright light and a 240 foot more of dim light. Any Invisible creature caught in the bright light is revealed.

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Reactions

Harpoon. When the Behemoth sees a huge or larger creature take flight it can use its Reaction to fire its harpoon at it. Strength Saving Throw DC25 or be grounded.