Manual

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However, if the highest-level party member is much higher in level than the
monster killed, that player will not get experience, and in turn, no one in
the party will get experience.
While it can sometimes be beneficial to have higher-level players in your
group to help you fight monsters, they can reduce your experience reward.
Thus, try to group with players close to your level.
Group Looting
There are three looting systems in a group. The default system is round
robin. Only the party leader can change the looting system.
Round Robin: Players take turns looting the monsters killed by the
party. When a monster is killed, one player in the group is allowed to
loot that monster. When the next monster is killed, the next player is
allowed to loot. This continues until the first player’s turn occurs again,
and looting continues to pass among the members of the group.
Free For All: There are no turns or waiting. When a monster dies, it can
be looted by anyone in the party. The first one to reach the dead
monster gets the loot.
Master Looter: In this loot system, only the party leader can loot kills.
It is then the party leader’s responsibility to distribute loot to the rest
of the group.
Looting Quest Items
Some quests are collection requests that require you to collect quest items
off the bodies of dead monsters. These items are considered normal loot,
so you must wait your turn to get them if using the round robin system.
This type of quest item is often called a single loot item, because it can only
be looted by one player.
However, there are some quests that ask you to bring back a specific quest
item from a unique character, such as an NPC’s head or a stolen item. These
are bounty quests, and the quest item you need is a group loot item,
meaning it will spawn multiple copies of itself so that every party member
can pick it up. You can even loot this item when it isn’t your turn in round
robin. No matter what loot system is in effect, the corpse and the group
loot item will stay up so that everyone in the party can loot it. The
exception to this rule is that if you were not in the vicinity when the
monster was killed, you cannot loot the group loot quest item from it.
The game does not tell you which quest items are group loots and which
are not. However, in general, a quest item from a unique enemy character
tends to be a group loot, while a quest item from a non-unique monster
tends to be a single loot. The head of Edwin VanCleef is a group-loot item,
while Bloodscalp troll ears are single-loot items. The former is a drop from
a unique NPC, while the latter are drops from non-unique monsters.