Your stats

97 Vitality

To ensure that you are tanky enough to not get one hit by high-level mobs. This will also help you be immune, or almost, to certain Negative Buffs like Stun, Blind, Poison, Curse, etc.

135 Dexterity

Note that this is before the Blessing Buff. This helps you have shorter skill cast time that would be very beneficial during threatening times. Also, the reason it is before the buff is HPs normally do not pay that much attention to you so let’s be realistic here and take care of ourselves. Let’s be almost Instant Cast before their buff. 

60 Intelligence

Note that this is just the minimum recommended amount of Intelligence so that your SP pool is around 1500. Having a high SP pool would greatly benefit those you give SP to. Just remember that giving SP to High Wizards is very disappointing as their Intelligence is triple yours... 

10 Strength

This is so you can carry the consumables you need to carry without being 90% Overweight. Unlike High Wizards and High Priests, Professors can function well even when 89% Overweight.

Your consumables

5 Green Potion

While you are immune, or almost, to most negative buffs due to your high Vitality, you are not immune to Confusion. Confusion is that negative buff that makes your character go everywhere but that cell you intend it to go to. To remedy this, a quick chug of Green Potion helps.

100 Condensed White Potion

For that emergency Heal like when you need to wear GTB or when you were just resurrected and mobs are still all around you and you need to run. Since I am writing this, I recommend you buy Milk Chemist's Condensed White Potions. As of writing, she is not number 1 but she's up there.

200 Grape Juice

Why bring Grape Juice when you can just convert your HP to SP? Well, sadly, you cannot convert your HP to SP when you absolutely do not have SP. Also helpful when you really need to give someone SP and converting would take longer.

300 Cobwebs

Never forget to bring cobwebs when you are a Professor. This helps you save yourself and the party from rogue mobs. Good to note that when going to GMC Saen, having 500 is not crazy and highly encouraged.

10 Yggdrasil Leaves

Always bring these to resurrect the High Priests or people that died too far from the party to help out.  

30 Fly Wings

This is for GMCs as you cannot teleport in the Endless Tower. You need to keep yourself alive so when everyone is dying and you’re about to die, fly. Save yourself so you can save others. I also recommend to purchasing the Infinite Fly Wing from the Eden Group shop as you would probably need more than 30 for the worst of cases or you can purchase a Teleport Clip (Any accessory with Creamy Card) to help manage your weight.

Your gears:

Lord Kaho's Horn

Any Midgear Int+1 [Mistress Card]

Pussy Cat Bell (Recommended but not a requirement)

Any armour [Marc Card]

Lucius' Fierce Armour of Volcano [RSX Card]

Any staff that gives Dexterity and Intelligence is recommended such as, but not limited to, Dark Thorn Staff or Survivor’s Rod or Any book that gives the same status points

Any shield [Medusa Card]

+7 Stone Buckler or Valkyrja's Shield [Alice Card] (Recommended but not a requirement)

Any shield [Golden Thief Bug Card]

Any garment [Deviling Card]

Any shoes [Eddga Card] (Recommended but not a requirement)

Any shoes [General Egnigem Cenia Card]

Any accessory that gives Dexterity is recommended such as, but not limited to, Celebration Rings

Your Main Skills 

Cobweb

Soul Change

Health Conversion (Minimum Level: 3)

Monster Property

Land Protector (Minimum Level: 3)

Safety Wall Level 10

Deluge

Violent Gale

Volcano

Wall of Fog

Dispell

Gameplay

Keep an eye out for Biolab mobs. Make sure you web them especially Lord Knight Seyrens to keep the party safe. For High Priest Magaletha, cast Land Protector under it so that Snipers will not have a hard time hitting it as it casts Pneuma when receiving long-ranged attacks. Cast Land Protector on the party upon encounter of High Wizard Kathryne so that her Storm Gust does not kill the party. Lastly, after successfully trapping Paladin Randel using your web, Dispell him as he casts Defender, making Snipers’ damage low.

Give the Snipers SP whenever you can. Ask for High Priests to lay Sanctuary under you so that you can continually convert your HP to SP.

Always ask the High Wizard and the High Priest before trading SP as their SP pool is much higher than yours. If you trade when their SP pool is a quarter or so full, you would actually be taking their SP rather than giving.

When the Champion is tanking MVPs that suck SPs (like Kraken), or with mob spawns that suck SPs (like Thanatos Dolor), coordinate with them as to when they are about to re-cast Steel Body so that you can trade SPs for it.

Cast Deluge when the MvP or mob is weak to Water, Violent Gale when it is weak to Wind, and Volcano when it is weak to Fire. If unsure what it is weak to, use Monster Property.

Be mindful of where and when you cast Land Protector as it also prevents your party from casting Pneuma and Safety Wall, and even casting the Teleport Skill. Sanctuaries are also rendered useless on top of Land Protectors

Cast Volcano under the Snipers all the time only if all the Snipers are wearing Lucius’ Fierce Armour [Gloom] as it amplifies their Attack greatly.

Make sure to use your Safety Wall whenever to tank mobs from behind the party or to save party members from dying.