Rate my Moonblade!

So, within the next 2 sessions, my currently Level 6, Half-Elf Ranger will be getting the Moonblade that belonged to his mother. He is a two-weapon fighting Ranger.

Moonblade: Longsword, 5 ft. range, 1d8(1d10 two-handed), light, finesse, magical, glows in the presence of Undead and Abberations.

This gives him a very minor damage bump, the magical property, and an early warning system against creatures that defy nature. I also plan on letting it level with him to an extent. Maybe +1 at Level 10, +2 at Level 14, and +3 at Level 18.

Edit: Let me know what you think!!