All-New Homeing Missile Code
Spell-independant homeing missiles, that is, in vanilla you can't really do much with the real (not fake) homeing missiles like Bone Spirit since they utilize all functions except for the SrvdmgFunc and SkillStartFunc. (fake homing missile = chain lightning et al.) so no 'Teeth of Homing Missiles'. I've solved this problem by adding my own code to do this the proper way. This means there will be homing missiles with trails, collision effects (think about homing Immolation Arrow-ish things), Homeing Teeth-ish stuff (etc)
--- fresh from the coding millSelf-Upgrading Missiles
In D2 there are useless pre-requisit skills, like in the Ice Bolt -> Ice Blast -> Glacial Spike family. The way metalstorm handles spells like this is a bit different. For example at low level the spell may fire a ice bolt, but the missile changes with increasing slvl, so when it is at mid level it may fire a Ice Blast and at high level a Glacial Spike.
Prayers / Blesses
Some spells that are of sprititual nature will bestow random party members depending on certain criteria. For example Prayer in MetalStorm concept is not an aura but a castable healing spell, it will heal the most injured player in the party (and also cures that player if needed). This is independant of the act / level people are in.
Spell-Generated Items
Many spells will create temporary items for you to use. These items cannot be sold, traded, dropped, removed (if you die the item is destroyed), repaired and aren't saved (and in some cases will likely vanish after a specific amount of time elapsed). For example a spell like "Magic Armor" creates a magic armor if the player has non equipped, these items are generally requirement-less and have much higher base stats then what is generally found (for a armor like this the ac would depend on slvl). With the throwback that it lacks magic modifiers. In the case of Magic Armor discussed here, the armor has the advantage that mages can wear it, without being unable to cast spells (normal heavy armor has this side effect).
Random-Effects
Some projectiles will have random effects, think about it like a missile that depending on sLvl recieves additional effects to its pool, so at lvl 1 it may only scare monsters, at lvl 5-10 it may get things such as confuse and taunt effects, and later things like petrify and instant death (of weak things). And also teleport the target to random places.
New Minion Concept
There will be spells that allow you to turn minions into time bombs and similar things (or sacrifice one minion for another, aka minion x can only be cast utilizing minion y, which in term gets killed), as well as passing commands to them and generally they will have a smarter AI (either defensive, protecting the character or offensive - etc)
New Anim Sequences and Retaliation
Many spells have sequences specifically created for them (same applies to melee abilities), so expect combo moves and stuff like this
--- Retaliation is a totally new concept in sorts, in vanilla skills like DEA are a form of passive-retaliation to attacks, that just prevents you from getting hit. In 'MetalStorm' there (already) is a retaliation ability which will kick the living daylight out of whatever struck you successfully (however you have to actually get hit and take damage for it to trigger).Thats that, the above is by far not complete, just some things of the top of my head
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