(warcraft III frozen throne) character won't reach lvl 6

hi i'm new to warcraft and the skillset says that with aldos firestar you can summon a phoenix at lvl 6 (custom game) but somehow he won't get exp when he reaches lvl 5. i killed many hydras but no luck. help?

If I remember well, when your hero reach lvl 5, you have to kill other factions' units for him to gain exp, so killing neutral units won't work.

hey ive got warcraft to just keep killing enemy units youll eventually level up

You need to kill units other than creeps to level your hero up.Except if you're playing official maps or dota, you can gain experience by killing any units.