Arcane Sentinel

Immutable Form. The golem is immune to any spell or effect that would alter its form.

Magic Resistance. The golem has advantage on saving throws against spells and other magical effects.

Magic Weapons. The golem's weapon attacks are magical.

Multiattack. The golem makes two slam attacks.

Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage.

Slow (Recharge 5–6). The golem targets one or more creatures it can see within 10 feet of it. Each target must make a DC 19Wisdom saving throw against this magic. On a failed save, a target can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the target can take either an action or a bonus action on its turn, not both. These effects last for 1 minute. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Arcane Siphon Shield lasts 10 minutes

once per Long rest can activate Arcane Siphon Shield 

Once activated the shield creates a Anti-magic Sphere 30 feet diameter all magic  fails within that sphere 

A shield 30 feet diameter stops all area effect abilities. ie fear 

One Target of your choosing must make a Spell save Int.  DC 25 or loose 2d6 spell slots 1/4 on a save those siphoned spell slots can be channeled into any party member you choose.

If Standing In your Sentinel stand.

Arcane Siphon Shield Extends out 1 mile

You can sense location, of all living creatures within that mile and can communicate telepathically

Advantage on Intimidation persuasion checks