Stone Defender

Medium Construct, Unaligned

STR
19 (+4)
DEX
10 (+0)
CON
17 (+3)
INT
3 (-4)
WIS
10 (+0)
CHA
1 (-5)
False Appearance.

While the stone defender remains motionless against an uneven earthen or stone surface, it is indistinguishable from that surface.

Magic Resistance.

The stone defender has advantage on saving throws against spells and other magical effects.

Actions

Slam.

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage, and if the target is Large or smaller, it is knocked prone.

Reactions

Intercept Attack.

In response to another creature within 5 feet of it being hit by an attack roll, the stone defender gives that creature a +5 bonus to its AC against that attack, potentially causing a miss. To use this ability, the stone defender must be able to see the creature and the attacker.

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Stone Defender

Source: Mordenkainen's Tome of Foes, p. 126 - Licenses and attribution