Arathi bombs will spawn that can be picked up by players. Carrying them to the Boss grants an extra button that can be used to deal around 6% of his health in damage. If they explode without being carried to the boss, they explode for damage on all players.
Carrying a bomb themself will deal light damage on that player.
Expel Webs spawn little swirls in a row coming out of the boss, exploding in a line and dealing damage to players struck inside of them and also rooting them.
Erosive Spray is a cast that deals heavy initial damage to all players, and additional damage every 1 second for 3 seconds.
Rolling Acid is an effect applied to one player, instead of two like in his its raid version. Upon expiration, it spawns a poisonous wave in the direction previously indicated by that effect on that side. Make sure to aim it away from players by either walking to the left or right of your party.
Upon reaching 65% Health, Rasha’nan flies away to another location in the dungeon. Players have to fly with their mounts to that location, travelling with the Light Boat to not be killed by Encroaching Darkness.
When he lands, he starts casting Acidic Eruption which increases in its damage until players interrupt him. During that time, he is immune to damage.
The new ability in the last phase is Spinneret’s Strands. This creates 10-yard circles around several players, and spawns Sticky Webs upon expiration. The affected players themself a tethered to the middle of these webs, pulling them slightly in and dealing damage while remaining inside. Breaking the link to the webs by moving out of it will explode with Spinneret’s Websnap for partywide damage, so you dont want to do it all at the same time.
Having Rolling Acid rolling over these remaining Webs will cause them to explode with Acid Pool, dealing heavy damage to only players still inside that web, and transforming it to another voidzone that deals very high damage to players inside.