Amulet of the Thornspeaker

This amulet bears the image of what seems to be a coiled serpentine vine, but it gives off an aura of chaotic energy.

A druid who wears the amulet may spend an hour bonding with the ring to learn its' secrets. If a non-druid attempts to wear the amulet, the vines will begin to burrow into the  wearer's chest, dealing 2d12 piercing damage to the wearer every 6 seconds until the wearer succeeds on a DC 25 strength saving throw, is reduced to 0 hit points, or the amulet's magic is nullified by a remove curse spell (6th level or higher). Additionally, if a creature who is not the wearer attempts to remove it and it unsuccessful, tat creature takes 2d12 piercing damage.

Once attuned, the wearer of this amulet is permanently under the effects of the Speak with Plants spell and any spells the wearer casts that would allow him/her to summons creature(s) of any type, may instead summon creatures of the plant type in equivalent quantity and challenge rating. The spell slot is still consumed if used this way and concentration is still used if the original spell required it. All other requirements for the spell remain unchanged. 

Additionally, as an action, the wearer of this amulet may rub the amulet and speak the words of power needed to cause the vines on the amulet to slither out of the amulet and take the form of a Thorn Viper. The Thorn Viper appears in a space adjacent to the wearer, has its' own initiative and obeys the wearer's commands. The effect lasts for 2 hours, or until the Thorn Viper is reduced to 0 hit points, or if the wearer of the amulet uses a bonus action to end the effect, at which point the vines return the the amulet. Once the vines have returned to the amulet, this effect cannot occur again until after the wearer completes a long rest.

Notes: Druid