The Beast Within -- A Guide To Blue Mage

I'm using the Zahak Reborn spell list, minus anvil lightning and with Battery Charge + Winds of Promy. I understand what some of these spells would be used for and when to use them, but others I'm confused about it.

Erratic Flutter - Haste2! (+30% magic haste)
Cocoon - powers up a lot your physical defense (+50% defense)
Occultation - a powerful (Blink + 10.. literally) blink effect that gives shadow according to your BLU skill /50 when cast. IE 600 skill = 12 shadows
Nature's Meditation - a buff to your physical attack (+20% additive)
Reaving Wind - resets target's TP (1000TP reset)
Feather Tickle - Reduces target's TP (random amount between 0 and 1500)
Dream Flower - dark based AoE sleep - your go to sleep, very large radius
Sheep Song - light based AoE sleep - very small 6? yalm radius
Yawn - Light based AoE sleep, slightly worse than sheep song... Lasts longer + wider radius BUT the targets must be facing you (Gaze attack)
Winds of Promy - AoE erase
Barrier tusk - Allows you to slightly break the 50% DT cap, doesn't stack with Phalanx (15% multiplicative damage reduction). If exceeding the 50% DT cap, it'll only provide half benefit (7ish %)
Orcish Counterstance - Counter steroid (+10%), useful when 'tanking' if you stack counter gear into your defensive set.
Sudden Lunge - very useful (and potent, up to 10+ seconds) single target stun
Glutinous Dart - single target long distance spell, can be useful to pull. *Definitely slap TH4 gear on this one
Subduction - AoE wind based magic spell that costs very little mp and puts a powerful gravity on enemy. Tipically useful to AoE magic cleave stuff
Entomb - Very powerful AoE earth based spell. Used to cleave stuff but also because it applies a "break" effect to all the targets hit (especially useful for crowd control in Sortie)
Tenebral Crush - Very powerful AoE dark based spell. Used to cleave but also to apply a def- effect (-20% def) on targets.
Anvil Lightning - Similar to the ones above but Thunder based. Applies a short stun to everything hit.
Spectral Floe - Like above but ice based and applies a small duration terror.
Silent Storm - Like above but wind based it applies silence.
Demoralizing Roar Frightful Roar - Applies an AoE def- (-10%) to targets without doing damage. Can be useful as an alternative to Tenebral Crush when you want to avoid damage? I guess
Sweeping Gouge - Potent single target Defense Down (-16%), very useful when you're fighting things on the go and/or cant afford to deal dark/AoE damage with Tenebral, only 4% weaker.
Magic Hammer - converts Light based damage done by this spell into MP for you IF the target has an MP pool
Diamondhide - weak AoE Stoneskin, can have its uses I guess? Forgot last time I used it but a long time ago I used it a lot. (I wouldnt say it's weak. It has a cap of 333(?), while normal Stoneskin caps at 350. It's true normal Stoneskin can be pushed to 475 with equip though and this cant.)
Refueling Battery Charge - Powerful refresh, affected by +refresh gear, nomnom
Geist Wall - AoE dispel, can be useful to "tag" targets if not to dispel them
Magic Fruit - powerful single target heal. Cure IV equivalent but cheaper
White wind - powerful AoE heal based on MAX hp on cast. Stack HP. Heals for max/7 x2 and affected by cure pot.
Saline Coat - powerful *Decaying* MDB buff. On time of cast MDB + 50 -> decaying down to +8 before it wears off (3 min duration)
Magic Barrier - Very potent stoneskin effect against magic damage only. Potency is 1:1 Blue Magic Skill and has no known cap. Extremely useful for TP denial method of tanking like Bumba v25
Embalming Earth - Similar use case as Subduction (but this one is earth based and apply 25% slow). It's useful to cleave low HP targets that resist Wind. It has also quite low MP cost and relatively low cooldown. It's also set for Attack bonus trait anyway
Palling Salvo - Extremely niche, but our strongest Bio effect. -10% atk down
Delta Thrust - Can be a huge part of Subtle Blow no TP gain approach if target doesn't resist Plague. Cast in full Subtle blow/acc/macc gear for that scenario
Quadratic Continuum - An alternate spell to close Darkness skillchains, used against Bumba v25 due to its high # of hits, making it less likely to miss. Stack Acc and Subtle blow.
Osmosis - It can be extremely useful for its absorb/dispel effect which can't be resisted (unless target is immune I guess) afaik. Good example is absorbing Shock Spikes from Ramuh Ambuscade
Regeneration - Not used, +25/tic hp for 30 tics base. In theory it's quite useful for any harder solos. Only 2 points to set and can be pushed to 35/tic regen with Telchine augments, which would sum up to 65/tic with Might Guard
Acrid Stream - Good spell to improve magic damage of other spells in a scenario, where Tearing Gust can't be used or it's effect wore off. It's usually set for DA/TA trait anyway.
Exuviation - small AoE heal and Erase. This spell is mostly use for one purpose. It has 640 CE/VE enmity generation per target. Which mean with Diffusion and hitting whole party you have 3840 CE/VE base enmity generation, which is really huge for niche scenario where you would like keep hate on BLU
Regurgitation - long distance spell that apply bind. It makes damage before applying bind, which means you can overwrite bind by breaking it with damage and applying again. It was extremely useful in the past for it's unique effect of doing ok damage over time without generating almost any enmity
Memento Mori - +20MAB. Used as buff to magic damage when single instance/burst of damage is very important, like Kaustra (used with Diffusion to buff SCH) for example.
Searing Tempest - High damage fire based nuke, but often not cast due to the other big nukes being better, however... Useful for Bumba as an additional Debuff, Potent Burn effect (INT down -63)
Sound Blast - Good cheap AoE spells to lower INT of targets before cleave. One of my favorite spells to slap Treasure Hunter +4 gear on, as it's often set anyway for MAB trait.
Fantod - Good spell to spam (only 10 sec base cooldown) for hate (320CE/VE enmity). Self target, so works on all tagged mobs (similar benefits of enmity generation to Foil, but with lower VE enmity, but you can spam it more and it's harder to interrupt with only 0.5sec casting time and higher Blue Magic skill).
Sinker Drill - Probably best physical single target spell to actually do damage. It's piercing damage type, so especially useful for targets where slashing is reduced/piercing is boosted (like Naakul bird in Sortie for example). With Chain Affinity it can also close Darkness after Expiacion (or open for it).
Thrashing Assault - Arguably the 2nd best physical spell, usually set in your kit regardless to achieve Triple Attack trait. Like Sinker Drill, pair this with CA + Efflux but to close Light Skillchains.


UNBRIDLED LEARNING good casts:
Mighty Guard - Your bread and better, insane buff often extended / made AoE with diffusion. +15% haste, +25% Def, +15 MDEF, +30 Regen
Harden Shell - Cocoon +1 (Def +100%)
Carcharian Verve - Short duration 20 MAB / 20% Atk boost (~1minute)... but LONG duration +10 'shadow' Aquaveil (~15 minutes)
Tourbillion - One of the Best def down effects in the game (-33%), often the most common spell to cast under Unbridled. I use it all the time due to not needing the haste from MG. Doesn't last long, usually only about a minute or so, great for zergs
Cruel Joke - AoE Doom effect. Quite effective against a wide array of mob family types, very useful for cleaving things that take reduced to 0 AoE damage like Sheol C. NOTE: You cannot move more than 5ish' yalms away from the targets or it loses effect.
Absolute Terror - Potent Terror effect that can last upwards of 20 seconds if unresisted. Seldom used, but can cheese certain fights such as Ramuh Ambuscade by freezing the summoner. (usually best with Elemental Seal)
Tearing Gust - Similar to Tourbillion, but for magic def. down. (-30 MBD). Used in specific mage boosting fights like Bumba to land massive Kaustras.
Cesspool - Similar to Delta Thrust, applies an even more potent Plague. -5/tic TP, but much easier to land. Fringe use, but used it some on Mboze in testing.
Thunderbolt - Similar in damage to Anvil Lightning, but a more potent stun. Sometimes used under unbridled wisdom when cleaving, since it has no cooldown to stunlock + damage a pack.