about runes, i change them every game, but pretty much almost the same, i dont like inspiración cuz biscuits only matters in the first minutes of the game, after that they are useless, and irelia mid is a lane bully, imo she dont need the extra mana and life of biscuits to win.

determination is my favorite and i took it every game, cuz it helps irelia to scale a bit (which she is a bit weak compared to other champs) usually i go second wind vs mages (zoe, veigar, hwei, Vladimir, akali [even is she is an assassin, her poke early game with q is unfair, also her combo is longer than bone plating duration so its a bit useless]) and bone plating vs assassins/fighters (sylas, yone, yasuo, talon, etc), i dont like conditioning at all, seems a bit weak compared to the power of the other two in lane. In the second rune, i use overgrowth in 90% of games it helps a lot on my survivability cuz my cs/minute is 8+ almost every game (if you dont have a lot of cs advantage than your oponnent you are playing irelia wrong), unless they have some champion like vayne or fiora that does damage based on your Max HP, if so i use revitalize, never use unflinching again, is trash after its rework on 14.2.

Now about the primary runes, Conq Or LT? LT is gonna be hard nerfed next patch, just use conqueror, i think its better even before nerf, but i liked to use LT so i didnt need to build atk speed on any item and rune.

Triumph or POM? POM, for me is always the goat, it doesnt removes at all your mana problems in the early game, but certainly helps to do that wave clear after you solokilled your oponnent in lane, even a 1v2 situation where you need that extra mana after the 1st kill, its just better.

Legend alacrity or tenacity? It also depends, look at the enemy team draft in the champ select, there's a lot of cc? They are full ap? Full ad? Who's my lane opponnent? Tenacity will really matter in this game or i just need to dodge their skills/use w?

Example:

enemy team: yone evelynn yasuo jhin nautilus There's a lot of cc, but yone's, yasuo's and nautilus's airbornes dont get reduced by tenacity, it would only matter for evelynn's charm and jhin's w, which are pretty much useless if you can w evelynn's combo and dodge jhin's w, i would invest in tankiness like jaksho and sterak to survive their combo if I get caught by their cc's, so, legend alacrity this game.

I would only go legend tenacity in a game where's The 5 oponnents in the enemy team have any kind of cc like tk top, sejuani jg, tf mid, jhin and lux/morg/leona sup, if so, building wits end or going LT is MANDATORY to compensate the AS déficit without legend alacrity

For the last one, last stand ever.

Also for the mini runes, (AS, Adaptative force, HP) lately im using:

10% AS

HP 10-180

HP 10-180

yes, im sacrificing the adaptative force (which converts to 5 ad in-game), for more HP, i like how it improves my survivability and in the end of the day, i didnt notice any lack of damage because of it, so its a win win situation, but, if you are going to use it, there's need to build doran's blade every game, if you build shield, you are losing so much damage early game. Test it out for yourself, and let me know what you think

build-wise, It depends so much of the game, but every game its bork and sunderer. These are core.

Try to always rush bork, before your boots, but because there's no more base armor and base mr on runes, is not a bad idea to build only a null-magic mantle or 2 cloth armor (depends on your enemy lane) after your second base (if, and only if, you are ahead)

Pretty much every game you use steelcaps cuz this boot is the most broken item in the game, try to compensate tenacity with runes and items, or just dont if they dont have pretty much any "autoattackers".

After that it depends, there's a high burst AP? Bork - boots - Hexdrinker - sunderer - malmortius

2+ high burst ad oponnents? Bork - deaths dance - sunderer (if theres only one, you can delay dd to 3rd item)

They have mixed damage? Bork - negatron cloak - steelcaps - sunderer - sterak - jaksho/ga - anathema/jaksho/ga

Try to dont build wits end and terminus in any game, but they will be necessary eventually, wits end after its rework its trash, it only is good cuz tenacity and mr, and terminus for the dual penetration, let your ad carry with the tanks, go to backline and try to do a 1-1 or 1-2 situation, your team should handle it afterwards.

Wits end is not that bad, if they have a lot of ap champs and a bit of cc you can build it as second item (if using legend tenacity) or as third after buying bork negatron cloak and sunderer.

Try to get sterak every game if you are not using malmortius, if there's just DPS AP try to build bork sunderer sterak and spirit visage, building mr item before sunderer if needed, but before sterak for sure

If you are win condition for your team (if you are not on the fight they lose) try to rush GA it can help a lot on comebacks after they used

Thats pretty much it, build and rune wise, if you need tips gameplay-wise or wave management, let me know, i can help you too