This is the guide for the first gate of the Abyssal Dungeon Ivory Tower of Chaos. This guide will cover gates 1 to 4. The minimum item level for this dungeon is 1600 for normal mode and 1620 for hard mode. The mechanics covered below will apply for both normal and hard mode.
The major mechanics for gate 1 are listed as follows:
The boss will teleport to the middle and initiate a stagger check. Purple and green seeds will fire outwards and players must collect 3 green seeds which increases the player's stagger. Each purple seed will decrease the amount of "green seed" stagger stacks by 1, so make sure not to touch any purple seeds. Not all players need to take 3 green seeds to succeed the stagger check. At the same time, you will also see yellow line telegraph attacks where vines will pop out to push you to the edge of the map, delaying the stagger check. So make sure to stand in the safe zone to avoid being grabbed. After succeeding the stagger check, plants will be spawn at the edges of the map which will try to pull you in. Make sure to avoid standing in the zone where the plants are. The plants cannot be destroyed.
The boss will teleport to the edge of the map and bombard the map with vines that will be indicated by yellow telegraphs. Make sure to dodge the vines. Soon after, she will teleport to the middle and cover herself in vines. During this time, she gains a shield where all attacks dealt to her will be reflected back at the player, so it's important to not attack her during this phase. At the same time, yellow powders will spawn somewhere on the map and the player with the marker on top of his/her head must run to the yellow powder. This can be easily done with a ping as soon as you see it, so it allows the player with the mark to run over to the yellow powder. The plants closest to the powder will try to attack the marked player. The goal is to get the plant to attack the yellow powder instead. Should you fail or accidentally attack the yellow powder, the yellow powder explodes and puts any players nearby to sleep. This sleep is cleansable by use of the sacred bomb or sacred charm. The yellow powders will constantly regenerate, so it's important to remove them as quickly as possible.
There will also be purple powders that spawn all over the map. These powders need to be hit towards the boss which provides her with a debuff stack as well as depleting her shield. This can be done by auto attacking the powder 2 times. When her stacks reach 15, she will become vulnerable to fire elements attacks. When her attack reflection buff is gone, you will need to throw the fire grenade as well as any fire element skills to destroy the vines.
If you have succeeded in destroying the vines, you will fight her with a lower difficulty. Should you fail the mechanic, her attack speed increases for the rest of the fight and it'll make it harder to finish the raid.