Gears for Drake Solo
High Priest Gears
Upper: Chubby Bunny/Hyzo Hat with Rata card - increases the damage of your Magnus.
Mid: Large White Wing with Mistress or Large Blue Wing - LWW for decrease damage taken 10% while LBW to nullify gemstone requirement + more damage if you cast Magnus Exorcismus. The card in LBW can be a resist card/status immune card/ one that increases damage like Rata
Lower: Flying Devil - Def +5, Reduces damage from magic attack by 10% (useful against that water ball)
Armor: Great Old Hauberk - Mdef +10, resistance to water 10% and it basically won't break from that water ball from drake. Moreover, the damage you deal with your Magnus at is increases matk by 5% and ignores 10% enemy's mdef.
Cloak: +7 or higher Nidhogg's shadow garb + marse card - mdef +3, increases resistance to all elemental properties by 7% and the card gives 30% resistance to water or Great Old Cloak - resistance to all elements 10%, matk +5%, ignores 5% of enemy mdef
Shield : Valkyrja shield + aqua elemental card - valk shield adds resistance to water, undead, and shadow property attacks by 20% +aqua elemental card decreases damage from water property attack by 20%
Shoes: +8 Tenebrous Boots with int3 orb or Tidal shoes with icering card - Tenebrous shoes is if you want high ME damage or if you want to go with more resist tidal shoes. Tidal shoes provides 5% tolerance to water property attacks and if you add icering card you will gain 15% resistance to water + increase in matk by 1 per job level
Weapon: +10 rod with 4 ancient tree cards or +10 rod with 4 aenbharr cards - ancient tree card for magnus and aenbharr for holy light
Accessories: water drop brooch, vendor's clip, spiritual ring +rosary with stalwart sentinel card - both the water drop brooch and vendor's clip are for resist but if you want to increase your damage with ME go with spiritual ring and rosary +stalwart sentinel card (increases damage done with holy by 3%)
If you want to kill drake just with the priest cast Magnus Exorcismus followed by Sanctuary though this would take quite some time so might as well use Soul Link potion and spam Holy Light (not really advised for fast runs but helpful if all others got frozen screens except for you, which actually happens from time to time)
But then killing it with just priest might take long so might as well bring a sniper. Let your priest find drake first by casting ME. Once you find drake leave it with Sanc and let your sniper walk to where your priest is. Just don't forget to keep your magnus on because if your sniper keeps on hitting drake, drake's water ball will be directed to the sniper instead of the tank priest.
Upper: Chubby Bunny/Hyzo Hat with Dark Ping or Duneyrr card
Mid: Large Red Angelwing with D.Ping/Duneyrr/LKC - LKC for zerk but not necessarily needed as a sniper can still damage drake pretty decently without zerk
Lower: Black/Orange Tie or Green Messenger Bag - Green messenger bag increases dex while black/orange tie atk +8%
Armor: Reset girl robe or Sniping Suit with gloom - the sniping suit doesn't have to have an enchantment of dex/luk 10 but it would be better if it has.
Cloak: +7 and up Heroic Backpack with Anunaki card or Flamel Emul - Anunaki card for more damage and Flamel for crit
Shoes: Fey Boots with Ascendant Orc card
Weapon: +7 and up Goblin Bow with AK cards + Holy arrows or +10 Coronis wing with Orc Combo+AK or 2AK +TG +Black fletched arrows (+20% long range damage with Coronis Wing) - If you're using Coronis Wing+Black Fletched Arrow, kindly ask the priest to aspersio you for more damage
Accessories: Recondite rings with Implosion and Dex3 orbs
And for pet a Pandaling would be really nice for both classes
Hope this guide helps.