fighting this monstorous spider

Heiwama woke up, confused about his surroundings, he also felt a hunger like he had never before. He then realised he had fallen to mana depletion and was now starving because of it, he decided to take some of the orc meat he had gathered and luckily as his mana had refreshed he was able to utilize fire magic to cook said meat, after eating he felt refreshed, ready to take on this 15 ft spider, and he knew just how do do it. Heiwama was thinking about his previous world, where he would squish spiders with a book or something heavy, he was now thinking about doing the exact same but then with earth magic, it would take way more mana then he had at the moment so he decided to practice, first he made a tiny stone wall and dropped it on some of the surrounding ants, then he kept increasing the size and allowing his mana to return, after doing this for around 4 days straight he could now create a stone wall big enough to atleast severly injure this enormous spider, so he carefully opened up the stone wall, immidiately he jumped back as a giant spider leg almost stabbed him right through his chest, the spider had apperently set up camp right outside his little 'stone cabin' this was negating his plan quite a lot but then it hit him, he could just light the spider on fire which would hopefully burn his  webs as well, he did just that leading to almost all the webs burning down, then Heiwama abused his sand magic to sneak past the spider, the spider spotted him and dashed towards Heiwama however, this led to heiwama not being able to squish the spider just yet, and so a battle began trading hits with his sword this battle wasn't easy,  but then he saw an opening, he casted sand magic right infront of the spiders eyes, he dashed backwards and then quickly used earth magic, right as the spider dashed at Heiwama his entire head got squished clean off, Heiwama didn't have a lot of time to celebrate this victory as not only did he gain a ton of notifications, ( one of them being you leveled up! times 3), but he also felt the fatigue from all the magic he had used, his earth and sand magic had leveled up quite a lot as well though, but for now he decided not to pay attention to any of that and just rest for the day the last thing Heiwama thought about was how these changes were insanely op as he needed them for all the monsters later on, with that Heiwama boxed him in deciding he would deal with the spiders corpse another time.