Depends on your gears. I could start soloing at 140-150 with my gears, but the low HP pool will cause problems in higher floors as certain attacks can 1-shot you even at full HP and decent reductions (Spiral Pierce, Elemental Attacks, Earthquake, Hell's Judgement, Meteor Storm, etc).
Here are some tips:
- Equips you absolutely need to survive efficiently are Alice Shield, Deviling Garment, Cranial shield, Anti medium shield, Unfrozen Wind/Water/Fire/Undead/Holy armors.
- From Floor 15 and beyond try to have FCP at all times!
- Toy Syringe is a super good headgear for mid-low levels. I highly recommend this for your first attempts.
- For Orc Lord and Baphoment, use Mercenaries and Homunculus to reduce EQ damage to manageable numbers. THIS one is super cool -w- Since EQ spreads according to the number of people, you can all summon a Merc at the right time and EQ will deal less damage that way, possibly keeping tank alive.
- Know how to obtain insta cast with stats. Percenteges are ok, but Slow Cast can screw you over. Have a Phen, Orleans or Magicflow handy if you can't insta with stats. Also, QUagmire gives you a cast bar regardless of stats, so keep a Phen/Orleans/Spellflow handy either way. This doesn't apply as much for non-Gene runs, but it's something to keep in mind.
- GTB: Shouldn't have much problem. If you do, Fire Armor and Alice shield should protect you from any potential OHKO.
- Mistress: Wind Armor will be enough to survive her Jupitel. She uses AGI Up so be prepared with a way to deal with it.
- Phreeoni/Maya: Damage is not high enough to be a threat. Just FCP for Maya (don't underestimate your luck, FCP even for regular mobs)
- Drake: Alice Shield and Water Armor should be enough to survive his Water Ball. Just pot accordingly. Since GX can't equip shield, you can increase resistance with alt gear like Nidd Garb [Marse], Water Pots, Leaf Cat card.
- Moonlight Flower: FCP and Alice Shield should be enough. Wind or Holy armor make this more efficient.
- White Lady: Same set up as Drake.
- Turtle General: I'd recommend same set up as Drake and Kite with AB/CC. Since he AGI Ups, be prepared as well.
- Samurai Specter: Hell's Judgement hits HARD. Deviling and Alice shield will help greatly here to prevent the OHKO. Since no Shield, you can use Dark armor + all the neutral resist. Pneuma can help a lot. Safety Wall is your friend too!
- Osiris: He's fast, so watch your HP. Deviling and Undead armor make this one a breeze. AGI Up, so heads up!
- Amon Ra: Fire Armor and Alice Shield help a lot. Don't wear Deviling here, Meteors hit super hard.
- Pharaoh: Same set up as Samurai Specter. Watch out for Dark Blessing! Reduces your HP to 1 instantly. Keep an eye on your life bar.
- Evil Snake Lord: Unfrozen Water armor and Alice shield will make this fight not as dangerous. Watch your HP! Nid Garb with Marse can help mitigate damage as well.
- Doppelganger: Deviling and Anti Medium help a lot! Anti medium over Alice because of the mobs in the floor. Stack all the neutral resist you can.
- Ygnizem: If Doppel isn't an issue, full Demi human resist, Unfrozen Fire Armor, Deviling Garment. Keep HP at full at all times! Even with DR, her Spiral Pierce can still one shot! Use all the HP and VIT buffs you need.
- Atroce: Deviling and Alice make him bearable. Watch out still when he Weapon Quickens. Hog a wall since he pushes around.
- Orcs: Use full demi human gears with Alice. If you have homunculus, keep it out for Orc Lord's Earthquake. It shouldn't be an issue wince you are in a party, so with 4+ people, you should be living his EQ.
- Dark Lord: Separate the MVPs here at all costs. Use Fire Armor and Alice shield and you should be fine. Raydric Garment helps, but don't use Deviling.
- Baphomet: Wind Armor and Alice shield plus Raydric. For Earthquake, try have a Homunculus and Mercenary, though, his cast time is enough for you to run away if you're fast. Kite if possible or use Homun to tank.
- Fallen Bishop: Dark/Undead Armor, Alice Shield and Kiting. He doesn't do Holy attacks while chasing so abuse that!! If you want to tank, what I used in the pre-OCP era was Gray Shield [Khalitzburg], Orleans Gown [Argiope], Raydric garment and Abysmal Knight Helm [Permeter]. Poison Armor is so you can resist Dark attacks without being weak to Holy! Gray set is super good for this reason!
- Ifrit: The reason I can't perfect a solo run. 90% of my deaths go here and just because EQ. I could kite him, but EQ is too fast, too big and it takes a while. Deviling, Alice shield, Fire Armor, Abysmal Knight [Leib Olmai], all of those help. Yggs are more efficient here than pots so use them wisely. Kill the slaves before starting and then AB like a demon. Key here is pace and rhythm. You want to AB as fast as possible. EQ will still wreck you though. When EQ strikes, just revive as fast as possible, continue AB and pray he doesn't do Full Divest. If you're not feeling lucky, FCP as you're reviving and continue assault. He's a tough one and you will die guaranteed 90% of the time. Since your DPS comes from GX, you can cheese him with CRS if you can move fast enough. Practice your Back Slide. You're a little underleveled to be taking him head on, but cheese strats are always a go! If you're tanking, hog a wall.
- Valk Randgris: Holy armor, Alice shield, Deviling garment. CC is more effective now on her. Same as Ifrit, EQ will be the biggest threat, but she has others methods of causing fear, like Holy Light, Weapon Quicken, Agi Up and Lord of Vermillion. You can kite her until she goes Agi and then spam CC until she drops. Revive if needed and just go at it. If you're fast enough, she won't even cast EQ. She will be the bane of your existence. Same with Ifrit, you can cheese with CRS but she's way faster so be really careful.
- Beelzebub: Pre-OCP I had to prepare so much for this guy. Now, he still is dangerous, but not nearly as much. Deviling, Alice shield, Undead/Wind armor. You gotta pot like crazy, but when Critical Wounds hit, you need Yggs to stay alive. I used to use Yellow Trans candy with Pumpkin Hat+Alarm Mask and use Pumpkins. Extra damage and extra healing. He AGI Ups when in Fly, so be careful. Most annoying thing about him is Critical Wounds, tbh. You'll need a way to combat it, like Yggs, HP efficiency increasing gears or something that constantly recovers HP. Stack as much neutral resist as you can with a bit of poison in there (Acid Breath hurts). Much, much harder to cheese with CRS.
- Enthweihen Crothen: Deviling, Alice shield, Dark/Unfrozen armor. Accessories with Errende Ebecce help here. Just advance slowly and kill them bones little by little. Patience is key! Don't rush and aim accordingly! Some bones and Ent use Defender so ranged damage will be nerfed a bit. If you can Dispell it, please do! Anti-push back gear is super good as well, as Arrow Shower can push you into the mobs and you'll die immediately.
- Naght Seiger: Deviling, Alice shield, Unfrozen Water armor. Keep your HP full at all times. Meteors, Storm Gust and Soul Destroyer will wreck you at low HP pools. Even at full HP, it can kill you with Soul Destroyer sometimes, so yeah, he can be super tough if you're unlucky. Any non tanks should use Unfrozen Fire Armor!
- Other floors to watch out for are Bio3 floors! For Cecil, use Deviling, Cranial shield. For Katherynn, use Unfrozen Wind, Raydric and Cranial. For Seyren use Fire armor, Deviling and Anti medium/demon shield. For Howard use Deviling, Cranial and FCP. For Eremes, use Undead, Anti medium shield and Deviling. For Margareth, Holy armor, Cranial shield. Walk slowly and scout with your humunculus. AB Howard and Seyren, CC the rest (dark on Margareth, ghost on Katheryn, Holy on Eremes, Iron on rest).
- Mini valks just use same set up as Randgris.
Hope these tips help. As I said, if you want to solo ET, it's mostly on gears and HP pool to see how efficient it will be. It will still be heavy on consumables as many things 1 shot you and you can't 1 shot many things, but follow these strats and you can make it.