Master and Commander

A deceptively simple-looking but elegant saber.
{1}Blood of Hydra. DC 13 CON or take
3d8 poison and be poisoned. Save every turn.
{2} Cause the Bends: DC 13 CON or take 2d6
necrotic and subtract 1d4 from attk rolls & ability checks. Save=no effect. Cast once per long rest
{3}Combat Mind: +2AC to melee and +3AC to
ranged from enemies with minds, duration one
minute. Cast once per long rest