Ancient Guardian

Radiant Protection. Enemies that move within 5 feet of the Ancient Guardian suffer 1d6 radiant damage

Unfair Advantage. The Ancient Guardian has +2 AC against non-magical ranged attacks.

Multiattack. The Ancient Guardian makes two longsword attacks

Patience. The Ancient Guardian may forgo its second longsword attack to increase it's AC by 2 until the start of it's next turn.

Longsword. Melee Weapon Attack. +4 to hit, reach 10 feet. Hit: 9 (1d10+4) slashing damage

Forceful Shove. The Ancient Guardian chooses 3 enemies that it can see within a 20 foot radius. Those creatures must succeed on a DC13 Strength saving throw or by knocked up to 10 feet further from the Ancient Guardian, suffer 1d4+2 Force damage, and be knocked prone.

Parry. When attacked, the Ancient Guardian can use it's reaction to add +2 to it's AC on this attack.