This is an overview of the strategy I use. I'm not sure if you're missing anything big, but it definitely helps for planning to know some internal details of the fight, like how much health it has and when it starts casting spells.
Decode with ROT13 (rot13.com)
V erpbzzraq hfvat gur 4 hfrf bs Zvenpyr Sehvg (NTV+) rirayl orgjrra gur punenpgref, 2 sbe rnpu. Lbh pna fgvyy orng gur obff vs lbh tb nyy va ba bar punenpgre, ohg vg'f uneqre. Sbe gur Crne (ZC+) V erpbzzraq ohzcvat Syner'f ZC gb ng yrnfg 22 fb fur pna pnfg Freranqr gjvpr va n ebj ng gur yngr fgntrf bs gur svtug. V qba'g xabj vs gur qvfgevohgvba bs gur Nccyr (UC+) obbfgf znggref gbb zhpu.
Gur obff fgnegf pnfgvat fcryyf jura vg trgf orybj 50% urnygu. Orsber gung cbvag, V erpbzzraq abg pnfgvat Freranqr ng nyy, naq univat Syner sbphf ba urnyvat naq Pbssrr. Abgr gung Pbssrr jrnef bss nsgre n srj gheaf. Fxl fubhyq sbphf ba xrrcvat Syner nyvir naq pnfgvat Funggre Fgne jura obgu punenpgref ner urnygul.
Gur svefg fcryy gur obff pnfgf jvyy cebonoyl pngpu lbh bss thneq naq qb ovt qnzntr gb obgu punenpgref. Hfr Dhvrg Zrzbel gb erpbire sebz vg (vs lbh pna trg n Freranqr bss jvgu Syner orsber hfvat Dhvrg Zrzbel, gung urycf).
Nsgre guvf, Fxl fubhyq gel gb xrrc hc Fbhy Zveebe ba Syner nf zhpu nf cbffvoyr gb oybpx gur fcryyf. Vg zvtug or jbegu pnfgvat Pbssrr jvgu Syner fb Fxl pna farnx va fbzr bgure gheaf orgjrra Fbhy Zveebef. Bgurejvfr Syner fubhyq gel gb raq gur svtug dhvpxyl jvgu Freranqr. Gur obff unf fvk uhaqerq naq fvkgl fvk UC, fb nsgre gur unysjnl cbvag, guerr Freranqrf jvyy rvgure xvyy vg be chg vg ba gur iretr bs qrngu.
Vs ehaavat bhg bs ZC jvgu Fxl vf na vffhr, lbh zvtug unir zvffrq n uvqqra Qentba'f Oyrffvat rirag gung tenagf ZC ertra, ohg V'z thrffvat gung'f abg gur znva ceboyrz.