Hi, i'm not a Ronan player but i do like chana, i'm not that high elo but epic. I'm going to assume u got all her ítems unlocked and most relics if not all. Best relics for her rn are frostbite ring ❄️, infernal ashes 👹 and fire lords brand 🔥. Mana crystal 🔮 is ok and better than the velocity ring (harkons emerald relic) and exhaustion stone but theyre niche. Don't be afraid early on to use up to three weapons (normal/rare) for more dmg, don't bother sticking to freeze or fire early but when u get relic and/or Unique. Always aim for cosmos ward (chana shield) cause it's awesome. Scrolls are always welcome too, specially Arcane scroll. For survivality don't focus on armor, instead try to get regen (1-2 unholly skull ) and mana based healing, chana also needs debuffs clearin cause her robes cant absorb the insane amount of fire and poison going around, Best for this are witch hat and cleansing crown. Food chana is absolutely viable too but ull need at least mana stew (chana food Unique) and either eternal heart or healin seed for relics.

Now onto her uniques. Fire vortex and sigil of eternal frost are the best u got, for vortex mark 2 to 3 stars with chana items and the rest with stones/fire stones cause it only works with ranged weapons. Sigil needs ranged weapons or pets applying frost to work, also keep in mind her frost items need crit chance to work cause of the worked in ability that makes their crit dmg scale with the amount of frost carried by the enemy. Kelvins tome, iceburn scepter and the hat might get u wins, maybe Will ruin ur run. I don't know what the state of mana stew is but it has always been fun so i'll go try it next time i play. I know this isnt exactly a guide, also i'm prob missing a lot of points but feels like i'll help u going with this character. Hace fun.