Grotto of Horror
Recommended party (easy mode and normal mode)
1 tank
2 healers (priest or druid/scout (priest preferred due to soulbound) and a druid/x)
3 dps (for normal mode you need strong dps)
Recommended party (hard mode)
1 tank (offtank possible for adds)
3 healers (priest/ knight or priest/rogue (due to bubble and cleanse and soulbound), druid/scout (due to group cleanse and cammelia) and a druid/warden (due to the ground flower healing))
7 - 8 dps (you need strong dps)
Trashmobs
Skelets
Those have 2kk HP in hardmode and 1kk in normal mode.
Those hit about 370k in normal mode and hard mode and have a huge range. On stairs they are grouped per 2, in rooms there's more. Fast kill them. Warden pet and Spirit Guidance (druid skill) come in handy. These mobs can 1 shot you as soon as you start attack.
Jellyfish (big ones)
Do damage but are ok killable.
Jellyfish (small ones)
They are grouped per at least 3. They do massive damage dot. Warden pet and Spirit Guidance (druid skill) come in handy.
Fish
They are kinda chained. Kill them fast 1 by 1. A warden pet or Spirit Guidance comes in handy to have a kind of tank. A tank can jump in too, but other option is safer.
Octopuss
Simply kill, nothing special.
Crying Siren
Simply kill, nothing special.
1. Aggregate of Desperation
Boss HP easy mode: 10.563.622
Boss HP normal mode: ..
Boss HP hard mode: 92.676.816
Nuke. When someone gets into a cage, destroy the cage. There will be chests. If you click them you get a debuff named after the ghost adds that spawn. With the buffs you can get 2 skills. One you can use on adds. Be carefull coz the adds will attack the people clicking on the chests. If you have enough dps you can simply nuke the boss, but there will be tons of lag here.
2. Nabukos
Boss HP easy mode: 10.561.104
Boss HP normal mode: 38.810.972
Boss HP hard mode: 92.654.728
Nuke. Stay away from jellyfish so tank at door you enter. Black ones do a dot. White ones probably help boss. The jellyfish are killable, but simply nuke. In normal and hardmode, use serenstrum or rock protection (druid skill) when the boss does his 1st cast "Salt Deflagmentation" (it does big damage). The first cast is around 10% hp of the boss if you have a nuke party 
Don't loot the staff if you don't want boss 4.
3. Yinajo
Boss HP easy mode: 11.027.972
Boss HP normal mode: ...
Boss HP hard mode: 102.164.248
Don't nuke at start since the boss has debuffs on him (kinda 90% immune to damage). Two Wind Elementals spawn, kill them and click on the crystal (looks a bit like a mailbox). Then nuke boss and repeat when adds spawn. You get aoe damage now and then when boss casts a spell. This can't be cut. The skill takes 70% HP and knocks you down. Before this skill cast ends, put heal on tank so tank gets full life after knockdown instantly. Spellcasting will be slowed too, so a priest or druid/scout needs to cleanse this harmfull effect fast on other healer and magic dps.
4. Yifirus
Boss HP easy mode: 11.044.008
Boss HP normal mode: 39.052.424
Boss HP hard mode: 95.069.248
Tank the boss and nuke. Use serenstrum to escape the first big hits. If you have a debuff on you (a big whirlwind, think its bubble debuff), not the small ones all get when fight starts, run away from the group asap (you will hurt other ppl otherwise). If you are slow with killing people will get a perm stun too (can be cleaned as its harmfull effect). The hits are % based. You will get huge dots (varying from 29k to even 100k) and have some spell saying some number from 1 to 5. There are 5 waterfalls but no idea if theres a tact related to that, seems not tho.
5. Tabokake
Boss HP easy mode: 10.524.301
Boss HP normal mode: 36.991.452
Boss HP hard mode: 53.834.184
Just nuke. When you see some sandwhirl on the ground, go away from it. If you stand on it you get jumped into air and get a 90% damage (in normal mode). The boss also has a spell that heals himself. I am not sure if you can cut it. It also does fallen rock attacks and slinge hammer attacks to random people.
<<< FROM HERE ONLY HARDMODE VERSION >>>
6. Tekoli-Wussa
Boss HP hard mode: 97.598.688
Fancy swords and pillars flying around. This is a simple nuke, but avoid the moving pillars as they kill you in 1 shot. Run away from boss after it dies and don't go back!! Don't even loot the mems. The next boss will spawn on top of it pretty fast.
7. Pikusate
Boss HP hard mode: 102.433.416
Something with spider adds and use serenstrum to survive hard hits. In general this is a nuke.
~original author. Aneiyaa anepedia.proboards.com