Raids

must have
Your buff potions have to last during the whole fight, so you have to balance the number of pots between healing and buffs depending of the speed of your death.
 * Pds.png deal 4xmore damage
 * Plc.png Reduces damage taken
 * Cdef.png Reduces damage taken
 * Lhp.png Good healing compromise

situationnal
These pots depend of your stats build.
 * aim pot : interesting in order to reach 100% acc (especially if you have to switch for a lower acc weapon). Raid monsters doesn't seem to have high eva.
 * luck pot : interesting in order to reach 100% crit (especially if you have to switch for a lower crit weapon).

reflexions

 * Ceva : raid monsters seem to have high aim, and rarely miss even with 80% eva, so i think it is better to have more of the other pots
 * lizard : because of their low attack speed, lizard doesn't seem interesting
 * Vampire : might be interesting if you fight alone, but if you are with a lot of teammates, damage is often spread and you may waste this pot. Moreover damage is irregular, and because of the burst you can not let your HP bar drop too low.
 * poison : doesn't work

Artifact :
Only Yin Yang shield +++

Devil egg maybe if full con build.

The other ones are useless.

General strategy :
CONNECT 7 to 10 MINUTES AFTER REFRESH +++

a lot of koreans join at the same time, and you will see a huge HP drop for the boss.

If you have a good upgraded weapon take it for the boss fight, and compensate the lack of crit or acc with a potion, but if you do not have the specific weapon, it is better to keep the old one. Keep an eye on HP, do not let it drop too low, and always get cDef and lowCrit potions activated.
 * Rem golem is weak against 2 handed axes or maces.
 * DK Skeleton is weak against 1 handed daggers or swords.

If the message "monster is attacking" appears, activate the Yin Yang shield.

Lower the number of HP Pot if you manage to connect at the same time as a lot of pther players, and increase the other number of pots.