The skill is transformed as soon as you begin your dialogue with the npc and it also marks the begining of the dungeon, because from that point onwards - mobs will begin to spawn. No, you cannot choose the skill, as it's always gonna be your main damage skill (usually it's icon switches into yellow-ish and when you hover over the skill it has a prefix that it's a transcended). So let's say if you're playing titan, your main damage skill is Fatal strike. After talking to npc it instantly transforms to Transcended: Fatal strike, granting it the AoE effect, increased damage etc. I ment the scrolls, that boost your attack / defense (Boost attack scroll, boost defense scroll), which you're getting from daily for free on L2 store by purchasing the reinforcement's kit. Auto attack feature CAN be used if you feel comfortable enough, but if you're getting overwhelmed, try kiting the enemies: they are slow and have no shooters, try running around, hitting once with transcended skill (usually it deals enough damage to either one-shot a bunch of enmies, or damage them severely), then running again, especially, if you can see that drinking hp potions is slow and doesn't save you from incoming damage well enough. Yes, do disable all the other damage skills, because they will simply do no damage, only the transcended skill deals enough damage to kill the monsters, that also includes other utility skills like rush , rush impact, anything that wastes your mana is not needed. You can keep the self heal though, but also it really depends on the situation. Say you're playing SE, your might of heaven will become transcended might of heaven, you have a number of healing skills, but you must be very careful not to overplay it with high-mana using skills like greater battle heal, it's best to stick with simple greater heal, but again only if you can see yourself overwhelmed. Hope that answers your questions.