Phant

So I use phantasma differently than coral. My phant's skills are only slightly different, but the focus of their use is based on a different strategy.  This build allows for your phanta to do bench damage, which is something I try to have most of my curios capable of.

skill Set:  Eventide, Darkmatter, Cosmos, Dark Energy

I prefer to use other curios against the twins, I hate watching my phant get wiped out when an Aesalon switches in to party.  I am sure coral's set up is better against the twins, this is really a build against everything else, or if necessary, prevent them from entering the front line,  The goal of this build is to load 3 debuffs on various enemy curios and then trigger them all with Cosmos.  If you can pull this off, you will usually have one dead bad guy and another with 4-6k of health missing. The pattern I try for is Eventide, Darkmatter, Eventide, Cosmos.  I will interchange Dark Energy in place of the second Eventide if I think that I won't live long enough to fire Cosmos.  The fun part is picking which curio I want to drop Darkmatter on.  It has a DoT that does about 1k damage per turn and 3-4k damage if dispelled.  I generally pick the strongest curio on the opponents bench that is not a light one.  This is a mana intensive build and doesn't use Brain Drain, so enhancing phanta with mana or boosts allow this cycle to be run more than once.  If you follow this pattern with Eventide and Dark Energy, you will be ready to restart the pattern and do it all over again.

Some bonuses to this build:

There are a whole bunch of players out there with greater refresh/refresh boosts on their curios.  If you place Darkmatter on one of these, most times you don't even need to trigger Cosmos to dispel it.  This allows you to save Cosmos and its energy, and you can restart the cycle much faster.

Frustrated with Twitch and others stunning you for two turns?  Don't let him get to the front lines with Darkmatter.

If you find youself against a supertech, spider knight or any other massive health monstrosity, forget the bench and add darkmatter to it for superior stopping power.

Finally, this is a great build to fight other phantasmas.  If you can time your Darkmatter to hit their phanta right before they trigger their own Cosmos, they do all the work for you.