Whenever the Guardian moves, he can move through enemies, but cannot end on their space. Additionally, when the guardian moves out of the reach of an enemy, opportunity attack will always miss.
Longsword: Melee weapon attack: +8 to hit, reach 5ft., one target. Hit: 1d10+4 slashing damage. The target must make a DC 13 constitution saving throw or have its speed lowered by 5 for 24 hours. Their speed can't fall below 5 ft.
Greatsword: Melee Weapon Attack: +8 to hit reach 5ft. one target. Hit: 2d12+10 slashing damage.