Ring of summon Minor Lemmings

While wearing this ring, you can speak its command word as an action to summon 1d20 Minor Lemmings.

The Minor Lemmings appear in an unoccupied space you choose within 120 feet of you. They remain as long as you concentrate (as if concentrating on a spell), to a maximum of 1 hour, or until they drop to 0 hit points. They then dissolve without trace.

While summoned, the Lemmings obey any command you give them providing it can be interpreted/obeyed in such a way that presents immediate risk to the Minor Lemmings, no matter what language you use. 

Can be used twice per long rest.

If two consecutive summons only yield 1 Lemming the ring becomes nonmagical.

Notes: Summoning, Control, Jewelry