Reacton

Notes:
 * Spawned by trading a Bone Charcoal to a ??? at (H-6) in Halvung.
 * Wiped with an eight man party, with a THF and NIN tanking. Has very fast attack speed, difficult to keep shadows up.  Defense seemed somewhat high.  Blade: Jin and Vorpal Blade didn't break 100, but a DRG's melee hits did around 90 average.  Most, if not all of a well-geared BLM's nukes were resisted (i.e. Fire IV for 68).
 * In a response to the BLM's nukes being resisted, BLM had 8 fire IVs go off for 900-1200 (he had 337 elemental skill). Nuking in elemental skill gear highly recommended.
 * It bears noting that the spawn point is very inconvenient to get to. It's recommended to use Nyzul Isle Staging Point and zone into Mount Zhayolm from the Greater Colibri Camp, via Halvung, then back into Halvung at (E-9).  From there you must go past two operating lever doors and a number of True Sight trolls to get to the gate at (K-9).  On the other side of said gate is a different map, and Reacton's spawn point.
 * Immune to Stun.
 * Immune or resistant to Silence.
 * Increases in size as the fight progresses, like Friar's Lanterns. Each size increase seems to result in a large attack boost and access to new spells.  Appears to cast no spells at first, spams Tier I Firaga after first size increase, then casts Flare II, Fire IV, and Firaga III after second increase.
 * Multiple WHMs or SCH/WHMs recommended for Divine Seal + Erase or Accession + Erase. AoE Burn combined with -aga spells make melees' HP difficult to keep high.
 * Skillchains and magic bursts seam a must, dragging on this fight is not wise.
 * Once reacton Self-destructs, he will die and NOT get up, he will just die and drop his stuff.