Train

 Roll 1d6, which will decide the effects of the spell.

1. The caster lets out an ungodly scream and a 10 foot wide, 120 foot long train erupts from the caster's mouth in a single straight line. Creatures that make contact with the train must roll a DEX save of 18, or suffer 8d6 bludgeoning damage and are knocked prone. Once the front of the train is 120 feet away from you/ it hits a barrier, the train is released from the caster's control.
2. A swarm of miniature trains spew from the caster's mouth, forming a sphere of a diameter from 1-10 feet up to 30 feet from the caster. each turn, the sphere can be moved up to 10 feet in any direction. Creatures caught within the sphere take 4d6 piercing damage and are blinded. Any materials softer that wood are destroyed upon contact with the swarm. The swarm lasts until the caster's concentration is interrupted, wherein it is released from the caster's control.
3. The caster sneezes out a an 8 foot wide, 10 foot high train that circles the caster in a radius of 10-20 feet. any creatures that touch the train receive 8d6 bludgeoning damage. The train passes through any non-living materials e.g. stone and metal armour. The train disappears when the caster's concentration is interrupted, wherein it is released from the caster's control.
4. The caster sighs and a 10 foot high, 10 foot wide train car materialises from their breath around them. The train has as many cars as the caster wants, each adding an additional 18 feet of length to the train. This train is controlled by the caster and can fly up to 60 feet per turn. The train cannot move through solid objects, can create light that can pierce magical darkness up to 120 feet from the train, and ejects it's contents (creatures and items included) when it is 120 feet away from the original conjuring location and is released from its caster's control.
5. the caster lets out a bloodcurdling scream, summoning a spooky ghost train from their mouths. The train is of seemingly infinite length, and creatures, other than allies, must succeed on a wisdom saving throw or become frightened for the duration. When the caster's concentration is interrupted, the train is released from the caster's control.
6. The caster coughs up a little train. Though they've never seen the train before, it holds enormous sentimental value. The caster, and any creature with wisdom below 13 that sees the train gains the urge to have it for themselves.  Only one of these trains can exist at a time. when a new "little train" comes into existence, the former one, and any value it had, is erased from existence. if the train becomes missing before the spell is cast again, it is no longer bound to it's owner and does not get replaced.

When the trains are released from their master's control, they gain free will and live as separate creatures, continuing to maintain their abilities/ actions e.g. the train conjured on a 1 continues to move at 120 feet a round, but can turn, or a train conjured on a 6 will go off to have tiny adventures with woodland creatures or something, i don't know, but will still be alluring to anybody who sees it.