Hi new first account gladiator. Equipment/lvling tips.

Hi. You're on the right track, don't add Vit yet. It's tough but it's gonna be worth it at higher levels. I suggest you cap CRT and STR asap @256. Do not add a 3rd stat yet and just save the extra stats. Once you get Apostolia (you'd be around Lvl180, I think) you can raise the cap from 256 so you can add more Str and Crt.

At level 200, you'd get the Pillar Blade skill which requires 2 seconds skill delay. You can either get it from dex (as a third stat) or equipment. 115 dex is 1 sec.

As per my experience, I don't recommend adding dex at all since skill delay is readily available thru equipment and crystals. I highly suggest you put Vit as your third stat since you will be receiving damage a lot.

For equipment, buy ones with Atk and Crt dmg. There's a lot of them on google. Play them as per your preference. I'll be sharing you some options.
Also you'd need skill delay equip if you wont be adding dex.

For now since you're only level 87. I suggest you wear an HP set since you'll be needing to survive a lot and you're missing Vit stat.

For level 87:
Armor - Saltus, Licht
Add - Miwi Hat, Ideasol
Weapon - any slot sword, gold rex is ok
Spec - Myrica
Xtals - Pilzts or Hp20

For your end-game equips
Armor- Dmail up, Ultimi (has SD), Licht (has SD up to 1.5s), Exelis (best for SD) Schwermer
Xtal - Magonza, Raton, Dorry (I don't recommend this because of Rate Cut penalty), Dajarte (not recommending this because of MRes penalty), Oritius, Minenaga, Imseti, Cerberus (has Crt rate penalty)

Additional - Suishin Katana (has Aspd penalty), Separation Arrow (has HP penalty), Vanregal (has res penalty), Barbarotita (has -SD), Passion Robe (only good at high level), Scalpelio (stronger Btita)
Xtal - Same with armors, except Magonza, Minenaga and Dorry, Vida

Special - Myrica, Atleta, any slot spec
Xtal - Warrior of Light (if you're gonna use auto a lot with Tempest), Beelzenoid (best for Damage)

Weapon - RTengu2, Air Strum (SD), boss elemental swords, Futsu no Mitama (for less inventory space), Claiomh Solais, Lamia
Xtals - Same as damage xtals above, Plazuda, Pulis (SD)

For AI crystals, I recommend SD and damage crystals (avoid ones with penalty).
Examples are Valtia, Zazel, GApe, Maelriel, Cheltil)

For abilities, I highly recommend Quick Use esp if youre the soloer type. Quick Cool of you have the cash. Technician if you'll be using a lot of Cerberus (or a Daiginjo for max dmg)
Hope it helps! If you need stats of those, let me know.