There are three options
- Reworking burst phase
- Reworking Titans
- Adding new summons
Additionnally
- Make RuinIV a cast
- Make summon a cast
The current issue is that, beside Titan to some extent, turning any "instant" to "cast" makes the SMN much less mobile than people realize. For real just try. Play summoner but do something like "I cannot move at all during this ability as if you were casting. You'll be shocked to see how fast your mobility goes down. (It's fun tho). Therefor, simply turning instant to cast is tricky and can swiftly turn SMN from a "range" to a "BLM from HW"
Reworking burst phase
Basically, make Pheonix/Baha/Sol not full of instant but rather a mix of cast and instant. This could also be an interesting way to make each of the 3 burst phase more differant than "the visual changes".
Reworking Titan
Basically making that his emerald rite is a 1.5s cast instead of an instant.
Because the recast is 2.5s, this still leaves amples time for weaving and basically turns it into a PIC doing light painting for a few gcd.
This wouldn't work on Garuda as 1.5s makes for a weird and unpleasant slide cast. Also, Garuda already has slipstream as a cast. (even if we use swift cast, that's irrelevant)
Adding more summons
By adding more summon, you can have a broader range of "static summons" and "free like the wind" summons. Assuming a "mobility level". 0 being "100% cast" and 5 being "100% instant", what we currently have is :
5: Titan
3~4 : Garuda
1~2 : Ifrit
0 : none
By adding Levi Shiva (We become icy white!) and Ramuh, we can have 6 clear level of mobility. 0 being "0 instant" and feeling the gap between all those.
Summon become available only after all 6 have been used. So every 2 mins a SMN would need to summon all 6.
With 6 levels of mobility, the player has agency on which usmmon to use where and can thus save all the movement one (Garuda/Titan) for specific moment and dump the turret summon else where.
This would be the most welcomed one and have the greatest impact as the intended design "choose where you put the difficult summon (ifrit)" would feel more alive.
From a UI pov it could simply be done by adding 3 new buttons or a single one which swaps the summon. For instance.
You have [Ifrit, Titan, Garuda]. when you press "Alternate summon, 10s ogcd".
They turn to [Shiva, Leviathan, Ramuh]. Which would be only a single button.
*As a side preference for the lolz*
I would see
4: Shiva - You turn to ShivaMode (since she's more of a phase change) and you have a melee combo with positional which you finish with a spell finisher. Everything is instant but you have the melee requirement.
1 : Leviathan - Raise the Tide! Each subsequent cast the cast and recast are longer. 0s/1s -> 1.5s/2.0s -> 2.5/3s -> 3.5/4.0s . Additionnally you have whirlpool, a forward dash ogcd dealing no damage. 2 charges.
0: Ramuh - First it works like a Ten-Chi-Jin. Any movement stops the phase.
When entering Ramuh mode, you gain 1-3 "electric charge". You have 2 spells, "Charge" instant-1.5 recast, and "Convert" instant-1s recast. Convert consumes the electric charge. Each consummed charge creates a floating lightning orb around you.
Charge grants you 1-5 "electric charges". However they don't stack so f you use "charge" before you've converted all the one you had, they're lost. You will always be able to reach 7 charges no matter what you start with. You have 3 sources of electric charge. 1-3 from the initial cast and 4-6 from the 2 casts of "charge". The rest is you converting those charges. Once you reach 7 charges or if you move. Charge becomes "Discharge" and deal X potency per floating orb. Discharging at 7 grants a small bonus. Discharge is always a Crit DH
Due to the rapid recast, this requires sharp focus but specifically because you cannot move, this is meant to be done while the boss is doing absolutely nothing and thus you can direct all your focus on the fast paced mechanic. Ramuh has effectively 0 movement. You're a turret for 10s and 10s worth of DPS results in some very spiky damage visually.
This would result in
0: Ramuh (Ten-Chi-Jin fast paced)
1: Leviathan (100% cast but you can move and dash around)
2: Ifrit (2 big cast 2 movement, in melee)
3: Garuda (1 very big cast and instants)
4: Shiva (all instant but melee)
5: Titan (full instant)
With this, you wouldn't be able to spend 90% of time with instant because you'd have to choose moment where you wouldn't be able to move much. Basically, on top of ifrit you also have to place Ramuh and Leviathan which are much worse. Shiva has great mobility but isn't suited for all moment as you want to hit positionals. Recklessly using Garuda Shiva and Titan in a row would result in a very rough min after your major summon. And vice versa.
Additionnally
RuinIV could be made a cast... not much but that's still a thing
Summoning could be a 2.5-3s cast. The issue with that would be that summoning occur at fixed moment. This would make SMN the only caster with very restrictive cast every 15s. While it would adress the issue I believe this to be something that should NOT be done.
The most reasonable first step would be to make Titan spell a 1.5s cast.
1.5s is short enough to allow for a decent mobility like a PIC or Healer. Not good enough if you need to zoom around, but good enough for most regular movement.
However I insist, people understestimate how "even that" can make for a rather strict gameplay. Unlike RDM, BLM and PIC, you never have "on demand" instant. You have on demand "phase". IT's a bit like AST with light speed. Sometime you just need a single spell, like a xeno/miracle in white, not a full blown 15s worth of instant.