Here's a list of skills i made for my project "Plantera adventures" (which i am yet to post). It may be worth noting some of these are inspired by certain Final Fantasy skills. All these skills are done with proper scripting.
Eliminate/Warp - Used by machine enemies, erases target from battle. The character affected by its associated status effect "Erased" (associated with the message "Disappeared!" when it successfully hits) will be untargetable for the duration of the battle and flagged as a dead character. Unlike death, the target simply vanishes and their HP is left as is.
Maximo - Used exclusively by my game's resident superboss Regis battler (another machine enemy). It deals a volley of statuses on a randomly chosen amount of characters, the least is 2 characters dealt with random status effects while the most is 4. Inspired by the Final Fantasy 6 enemy ability "mind blast" and the Final Fantasy 5 enemy ability "Grand cross".
Defender - Used exclusively by the defensive type character in my project, Geo Colin. It makes the user step forward to take hits for the party by being the only character that can be targeted by enemies. The effect stops when the user is killed (Erased, Fossilized, Zombie, death) or when the user stops defending. The skill before its usage is called ---Defender--- and changes into ---Stop defending--- while defender is in effect.
Multistriker - Used exclusively by the offensive type character in my project, Jarov Morsite. It is more of a FF5 "Rapid fire" type skill, however, to unleash individual physical attacks, the player has to keep on tapping the button "Z" repeatedly. It is more of a button mashing type skill. The most number of hits a player can unleash is theoretically 90 but since the conditional branch that asks whether or not the button Z is being pressed processes faster than the player could tap the button Z, normally, only 5-10 hits could be unleashed. The down side of this skill is that it needs to be charged up for a moment.
Light gun - Used by machine enemies, deals unblockable, unevadable, unreflectable, non elemental, defense ignoring damage to the target equal to 1/2 of the target's maximum HP and inflicts bleeding, a slip damage status effect and pain, in which stuns the target for 1 turn.
Omniverse - Targets enemies and allies nullifying all status effects positive and negative (except death and erasure). It interrupts all charging up skills.
Barrage - Launches missiles at opponent, halving their MP and dealing moderate fire damage.
Seal of death - Enemy ability. Inflicts a status with the same name in which affected targets will gain doom timers, if the doom timer runs out, the target will be zombified (a status which flags the affected character as dead). The zombie status can be healed however yet if the healed character is killed again, the character will be revived as a zombie.
Flying square - Used by enemies, usually by those that form groups of four. The caster(s) creates a quadrangle which is then launched at a single target inflicting fossilization (a game over status the same as petrify). Some enemies may cast this skill alone.
Strangelet - Launches an unstable particle which spins for a while and hits a single random combatant in the battlefield friend or foe. Affected character is hit with a ton of status effects and heavy damage.
Meteor shower - Showers defense ignoring non elemental projectiles on 4 random opponents.
Snuff/Blow/Super fan - Kicks out a random character from the battlefield. The first two are enemy abilities that always hit while the last one is dealt by one of my character's tool weapons which has a calculated probability of success and may miss on some enemies. When all the party members are ejected (or some ejected and the others dead, erased, fossilized or zombified), the battle ends and is considered a draw, experience is not awarded nor does it count as a Game Over.
Shifter - User changes its physical properties. It gains a random element to absorb, another random element to be weak to and nullifies the other elements. Works through common event.
There are many more though i don't have time to list them all.