Rare Weapon (Glaive), Reach, Two-Handed, Requires Attunement

• You gain +1 bonus to attack and damage rolls made with this magical weapon.

Steadfast Star. The star fragment empowering this weapon shields itself and its wielder from being veered off its astral course.  If an effect pushes you or forces you to move or be knocked prone, you can use your reaction to stay in your place without being knocked prone. 
Northern Light (Recharge 5-6). You can use your bonus action to imbue your next successful attack with this weapon with the power of the Northern Star, focusing its light on your adversaries.
The next time you hit a creature after activating this feature, they become enveloped by a column of bright light with a 15-foot radius centered on them that lasts until the start of your next turn.
The target loses invisibility and cannot become invisible while under this effect, attack rolls against them have a +1 bonus, and they take extra 1d4 cold damage each time they are hit by an attack.