Nerf Scrapbots (25 player)

I think I made an interesting discovery on this one. I was trying to solo this and after failing multiple times I just started kiting XT and making him run over the bomb bots and scrap bots, as I did this i noticed my counter for the achievement was going up.

It still failed because there wasn't enough scrap bots up but, on my next attempt I did the same thing, only I made sure he spawned more adds first. Then, just like the earlier attempt I just made him run over the scrap/bomb bots, and sure enough I got the achievement.

I'm not sure why this worked but I'm not gonna question it. Hope this helps anyone who still needs it.

This is how I did it, no slows, no CC and almost no movement involved.

1.Pull XT to the top of the scrap pile to the top left corner.

It's important that he is as far up as you can take him, even 10 yards further down and you will have the Scrapbots and Boombots crash into him as he stands up after second heart phase.

2. DPS him to 50% so that you get two back to back heart phases.

If you are unable to do this before the first heart phase just damage the heart, it takes 100% more damage, just be careful so that you don't get him under 25% as that will trigger three heart phases in a row.

3. During the first heart phase, watch where the Scrapbots are spawning from (you can see XT cast a lightning ball at the location). Ideally you want to have both groups of Scrapbots coming from the other side of the room. If you are a class or race (night elf) that can easily reset the encounter, I recommend resetting the encounter until you get the ideal spawn during the first heart phase. If not you can still try if you get at least one group on the other side, though it becomes harder and more luck based.

4. After the first heart phase with a bit of luck, you will have groups of Scrapbots coming from the other side. Unless you have a very wide AoE-slow or root I recommend just standing still, abilities that doesn't hit all will just cause problems down the line. There should be enough time for XT to go trough two heart phases without these reaching him.

5. When the second heart phase starts, start moving to the scrap pile in the top right corner. When he exits the second heart phase he should be rushing towards you killing everything in his path. If there are Scrapbots coming from the side of the lower right corner you can simply move yourself a bit so he hits those as well.

It may take some times to get the correct spawn locations, but doing it like this you should be able to complete the achievement in just a few tries.

Prerequisite: It will be extremely difficult (rare) to get this achievement if you do not at least have DPS to kill a heart as chaining 2-3 heart phases back to back is highly recommended, if not required, to reduce RNG failures. The objective demands a a fairly rare occurrence: 20 scrapbots up at once with a boombot, all within close proximity of each other. Kill the boombot and its explosion will likely destroy all the scrapbots near it all in one shot. There is a 12 second time limit on this so it's not possible to kill 5-10 scrapbots using this method during each heart phase.

Note: RNG is a painful factor in getting this. If your DPS is exceptional and can get Must Deconstruct Faster basically every time, then you should consider getting a 3rd heart phase in a row. The way I suspect that this works is 3-5 waves spawn each add phase. They can be either: A) 1 Pummeler, B) 5-10 scrapbots, C) Boom Bot + a few scrap bots. You can probably imagine that you can easily get screwed over on RNG. If you are purposely going for this, you will /facepalm when you see Pummelers spawn. You will likely need many attempts to get this achievement.

Strategy

Positioning: Tank XT between 2 piles either on the left or right, against the wall, rather on the stairs. This makes it much more likely that bots spawn in the far 2 scrap piles unless Blizzard makes a change.

Special assignment: Assign people to leave AoE slowing effects down near the far scrap piles to prevent the first heart phase spawns to not be so far ahead of the 2nd heart phase bots. Shamans (healer pref, as there's nothing to heal when chaining heart phases) and Hunters can quickly ghost wolf or aspect of the pack over once the first heart phase begins.

Process: Get XT down to 75% to trigger the first heart phase. Damage the heart down until it's 5% or less before it goes back up, but don't finish it off. Get XT down under 50% and trigger a second heart phase ASAP (should already be under 50% if you get the heart to 1%, which reduces XT's HP by ~33%). Hopefully, RNG was nice enough to spawn at least 20 scrapbots, 1 boombot, and no pummelers. Everyone, but the MT and MT healers, should now focus on bots, using a combination of whatever you have at your disposal: piercing howl, thunderstorm, frost nova, death grip, charge/intercept stun, chains of ice, etc to control the pack of bots (preferably relying on the more reliable abilities). If they are not controlled well and get close to the "converge point" (where the funnel together close to XT) without being grouped up well, you can possibly have a druid taunt XT and cat sprint kite XT along the outside walls to buy a little time. Beware that you still have to deal with light and gravity bombs.

If all goes well, congrats, you have just earned an achievement for playing the add spawn lotto and getting <scrapbots> <scrapbots> <scrapbots> <boombot> and playing with XT's toys and getting them to all go boom at once.

Addendum: Despite what was written on Wowhead's XT page, boombots *don't* follow normal aggro tables and beeline for XT. They do not self destruct or get sucked up by XT. You must kill them and they explode on death and instantly kill near scrapbots no matter how much health they have. They have 50.4k HP and have a 10 yard explosion radius.