Syphon

Syphon
Long sword +2 (1d8 +2 / versatile 1d10 +2)
Attunement 30 min.
Any living creature* (not attuned to Syphon) that
starts their turn within 10' of Syphon loses
1d4 necrotic life drain. The target dies
if this life drain reduced its hit points to 0.
Add a counter on Syphon for each target that
dies as a result of the life drain. Each counter on
Syphon grants the attuned 1 str. point until
a long rest is taken.