Elephants are fast for their size. They will push or kill weaker creatures in their path to reach you. An elephant will never retreat (they fight until death).
Field Notes:
Knights, should fight them with an one-handed weapon and shield. These creatures will kill monsters and move objects in their way to get to you. They can also Retarget.
Elephants are similar to Dwarf Guards, but have less defence and a weaker attack. A knight/paladin can kill it with 60/60, while mages can simple use Energy Strike. They usually come in groups, so be prepared to use some runes.