Quicksilver Elemental

Quicksilver elementals are a rare type of elemental. As a liquid metal they are regarded as part earth elemental and part water elemental. Quicksilver elementals are sometimes found on the material plane in the depths of mines but have also been seen in abandoned laboratories or factories. On the elemental planes they are commonly encountered where the elemental plane of earth meets the elemental plane of water.
Fast Metal. Quicksilver elementals are extremely fast. They move with a speed unlike most other elementals. On top of that, their silvery amorphous physicality makes it hard to focus your eyes on their exact form.
Whiplash. These type of elementals battle their opponents by staying out of close range and attack by whipping their target with an extended liquid limb. If an opponent comes too close, the Quicksilver Elemental will attempt to evade and move out of range as soon as possible.

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Quicksilver Elemental

Medium Elemental, neutral

Armor Class 16 (natural armor)

Hit Points 102 (12d8 + 48)

Speed 50ft., Burrow 30ft.

STR

14 (+2)

DEX

18 (+4)

CON

19 (+4)

INT

5 (-3)

WIS

10 (+0)

CHA

6 (-2)

Saving Throws Dexterity +7

Skills Acrobatics +7, Stealth +7

Damage Vulnerabilities Thunder, Cold

Damage Resistances Non-magical Bludgeoning, Piercing and Slashing, Radiant

Damage Immunities Acid, Poison

Condition Immunities Exhaustion, Grappled, Paralyzed, Petrified, Poisoned, Restrained, Unconscious

Senses Blindsight 60ft., Tremorsense 90ft., Passive Perception 10

Languages Aquan, Terran

Challenge 5 (1800 xp)

Amorphous. The elemental can move through a space as narrow as 1 inch wide without squeezing.
Seeping. The elemental can burrow through nonmagical, unworked earth and stone. While doing so, the elemental doesn’t disturb the material it moves through.
Silvered Weapons. The Quicksilver Elementals weapon attacks are silvered. Weapons that have hit the elemental become silvered for 8 hours.
Nimble and Quick. The elemental can take the Dash and Disengage action as a bonus action.

Actions

Multiattack. The elemental makes two Whip attacks.
Whip. Melee Weapon Attack: +7 to hit, reach 15ft., one target. Hit: 9 (1d8+5) Bludgeoning damage plus 4 (1d8) Acid damage