Elden Ring - Multiplayer - Erdtree Avatar in Limgrave

Since this is about the co-op multiplayer mode in Elden Ring, I will be including this quote of information about the game feature here:
[MULTIPLAYER]
Elden Ring has a multiplayer system that allows players to be summoned for both cooperative and player versus player (PvP) play over the Internet. Cooperative play involves the placing of a Summon Sign on the ground, which causes the sign to appear in front of online players. If another player interacts with the sign, they are transported into the game area of whoever placed it down. Cooperative players remain in the same world until the boss of the area is defeated, or until a summoned player dies and is sent back to their home world. PvP combat involves using a Summon Sign to directly challenge another player to a duel, or using an item called the Bloody Finger to invade the worlds of others.

• The Erdtree Avatar is a boss near the Minor Erdtree in Southern Limgrave on the Weeping Peninsula.

• My friend thought they might need some help battle it so they summoned me to their world through the Elden Ring multiplayer which is why I'm glowing red or gold.

• My friend started things off by hacking away at the Erdtree Avatar with his Bloodhound Sword which is really badass looking.

• While he laid down some melee on the boss, I cast a giant fireball called Flame of the Fell God before thankfully using my Ash of War, Bloodhound Step, to basically teleport away from a swing of Avatar's giant hammer staff.

• I cast another giant fireball and watched as Avatar's boss got eaten up by the flames.

• Unfortunately I didn't pay attention to its movements and got hit with a life-halving smash from its hammer-staff while casting a third giant fireball.

• At this point, after three giant fire balls, Erdtree Avatar's health bar has been reduced by half.

• I cast some more giant fire balls but Avatar moves out of their blast radius so I start running away from it while my friend throws a bunch of daggers from afar.

• While putting more distance between me and Erdtree Avatar, I take a Cerulean Flask(magic potion) and restore my FP (magic).

• I cast two more giant fire balls which nearly kill it while it activates its special attack of golden lasers.

• It dies in the middle of the laser attack but I also receive damage due to pausing for a moment.

• I get a Rune Arc as a reward and am returned to my world.