Cursed Giant

Cursed Aura. Any creature that starts its turn within 10 feet of
the Cursed Giant must succeed on a DC 21 Constitution saving
throw, or it takes 10 (3d6) poison damage and can't regain hit
points until the start of its next turn. On a successful saving
throw, the creature is immune to the giant's Cursed Aura for 24
hours.
Magic Resistance. Cursed Giant has advantage on saving
throws against spells and other magical effects.

Cursed Rock. Ranged Weapon Attack: +13 to hit, range 60/240 ft.,
one target. Hit: 28 (4d10 + 6) bludgeoning damage plus 9 (4d8)
necrotic damage.
Sword of Sorrow. Melee Weapon Attack: +13 to hit, reach 10 ft.
one target. Hit: 29 (6d6 + 8) slashing damage plus 13 (3d8)
poison damage.
Thunderous Strike. (Recharge 5-6). The Cursed Giant strikes the
ground with its sword, triggering an earth tremor. All other
creatures on the ground within 60 feet of the Cursed Giant
must succeed on a DC 21 Strength saving throw or be knocked
prone.

Rude Approach. The Cursed Giant moves up to its speed toward
one target of its choosing. It then makes a Sword of Sorrow
attack, it deals an extra 9 (2d8) piercing damage on a hit.

Swamp's Protection. When an attacker the Cursed Giant can
see makes an attack roll against a creature within 10 feet of
him, the Cursed Giant can impose disadvantage on the attack
roll.