i've got a total of 4 2-step dps keys that i use for arena/bgs.

the first looks a lot like yours, howling blast, necrotic strike, blood strike, trinkets. Also warstomp on a 10 sec round robin, and mindfreeze on a 2.5 second round robin. this is my standard go to spam key.

the second is my ohshit cooldowns dps key. It looks like this:

Chains of ice on round robin, every 5 seconds a differnt one casts, to avoid diminishing returns and to help stay on target. Icebound fortitude, lichborne, antimagic shell, summon ghoul, and death pact(to sac ghoul for health) at the end of this key is a few casts of target=self deathcoil, so that when you're undead via lichborne you get a buncha self healing.

third key is my "OMFG JUST DIE" healer killer key. it looks like this, and is usually used to burst someone down at the start of arenas, generally priests and mages... fuckin mages >.< lol The first four spells i want to fire off are 2 obliterates, 2 blood strikes, and then i want to be firing off necrotic strikes en mass so the first 4 keys in this two step should be a macro cast sequence on 4 buttons that does this
/castsequence reset=target/combat obliterate, obliterate, blood strike, blood strike, blood tap, necrotic strike, empower rune weapon, Howling blast, necrotic strike, necrotic strike, necrotic strike, howling blast, necrotic strike

what that will give us is a HUGE big burst to start with. diseases, then blood taps, for a free necrotic strike, then empower rune weapon to give us all our runes back. From there in the two step we want to call 4 necrotic strikes back to back, frost strikes, and 2 howling blast shots. this utilizes our death runes, any howling blast rime procs, and re-snares our target. If you wanted to get fancy you could sub in one slot on each of your toons instead of four necro strikes you could go 3 and strangulate on round robin to chain silence someone in the midst of your mind freezes. I have a separate key for that however.

what this will look like on your bars is this, in numerical order using 1 2 3 4 5 6, replaced with whatever 6 buttons you would use.

1. obliterate/bloodstrike macro
2. obliterate/bloodstrike macro
3. obliterate/bloodstrike macro.
4. frost strike
5. insert trinket or silence round robin or whatever in the last slot... i usually call outbreak on this slot but there's other stuff you can do here as well
6. i leave it up to you, i like to put obliterate here, and howling blast on occasion too. This usually gets used for the free cast procs from rime and the other talent.

Spamming this single target key, will work through that first macro over and over, calling everything in order. Its a HUGE burst but i dont generally spam the key, it doesnt snare everyone right away, but it is highly effective for death gripping in someone and bursting them down at the start of an arena or for open world pvp. lol


My fourth dps 2step key is a combination of obliterate spam and cc's, with lots of disease application/spreading and round robin on hungering cold every few seconds. You've probably already got a key like this tho

starts with a cast sequence
1 /castsequence reset=combat icy touch, plaguestrike, pestilence, obliterate, blood strike, obliterate, obliterate, obliterate
2 obliterate
3 hunger cold round robin
4 frost strike
5 necrotic strike
6 outbreak/trinkets